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Excel provides useful statistical functions for finding the variance of a data set. In general, these variance functions retrieve a set of values stored in a worksheet range and then make the expected calculation.

A variance, just to remind readers, is a common measure of describing the spread of observations in a distribution. A variance is related to another statistical measure, the standard deviation. A variance is equal to the square of the standard deviation.

Variance of a Sample with the VAR Function

If the data set you’re working with is a sample and you do not want to include logical values or text from the set in the calculation, you use the VAR function. For example, if you’re using a new production process that is supposed to increase productivity and have a series of data for the numbers of parts produced each day, you can find the sample variance. The VAR function uses the following syntax:

=VAR (data set range)

Variance of a Sample with the VARA Function

If the data set is a sample but you want to include logical values or text in the calculation, you use the VARA function. Excel counts cells containing the logical value TRUE as 1 and cells containing text or FALSE 0. The VARA function uses the following syntax:

=VARA (data set range)

Variance of a Population Sample with the VARP Function

If the data set you’re working with is a population and you do not want to include logical values or text from the set in the calculation, you use the VARP function. The VARP function uses the following syntax:

=VARP (data set range)

Variance of a Population with the VARPA Function

If the data set is a population but you want to include logical values or text in the calculation, you use the VARPA function. The VARPA function uses the following syntax:

=VARPA (data set range)

A Final Note About the Data Set Range Argument

One other note: You can include multiple worksheet ranges as your data set range argument when using the variance functions. For example, if you were calculating the variance of a sample using the VAR function and had your data stored in several different worksheet ranges, your VAR function might look like this:

=VAR(B1:B:10,B101:B110,B200)

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Charts allow you to visually compare data in five basic ways, which means that your first step in determining the appropriate chart type is often simply to consider what data comparison you want to make.

Identifying the data comparison you want to make

Suppose, for example, that you’ve collected detailed product sales revenue data for a golf equipment manufacturer. Using a chart, you might decide to look at this data in any of the ways summarized in the paragraphs that follow:

Part-to-whole Compares an individual data point value to the sum of a data series. Comparing

sales of a particular golf club set to total sales, for example, is a part-to-whole comparison.

Whole-to-whole Compares individual data point values to each other or data series to each

other. Comparing sales of a starter men’s golf club set to a starter women’s golf club set, for example, is a whole-to-whole comparison.

Time-series Compares data point values from different time periods to show how values

change over time. Showing monthly sales over the last year, for example, is a time-series comparison.

Correlation Compares different data series to explore correlation between the data series.

Comparing industry-wide sales to the average age of the population, for example, is a correlation comparison.

Geographic Compares data values using a geographic map. Comparing sales by country,

for example, is a geographic comparison.

Picking the right chart for a given data comparison

Once you decide what data comparison you want to make, it’s generally quite straightforward

to identify the appropriate Excel chart types and sometimes even to identify appropriate

chart sub-types. Here are some rules you can follow:

1. To make a part-to-whole comparison when working with just a single data series, you

might choose a pie chart. (Pie charts plot only a single data series.) You might choose a

doughnut chart or area chart if you’re working with more than one data series.

2. To make a whole-to-whole comparison, you might choose a chart that uses horizontal data markers, such as a bar chart or one of the cylinder, cone, or pyramid chart sub-types that uses a vertical data category axis and data markers. You might also choose a doughnut chart or radar chart.

3. To make a time-series comparison, you would typically choose a chart that uses vertical data markers, such as a column chart, a line chart, or one of the cylinder, cone, or pyramid chart sub-types that uses a horizontal data category axis and data markers. You might also choose the stock chart if you’re performing technical analysis of security prices. (Time-series charts typically use a horizontal data category axis because of the Western convention of using a horizontal axis to denote the passage of time.)

4. To make a correlation comparison, you might choose the XY (scatter) chart if you’re working with two data series or the bubble chart if you’re working with three data series. You might also choose the surface chart if you want to explore trends in two dimensions.

5. To make a geographic comparison, you would probably use Excel’s Data Map tool (refer to the Excel online help) or, possibly, the surface chart.

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A computer hard disk crashing is the stuff nightmares are made of for all those who depend entirely on computers for their day-to-day work. When one talks of a hard disk crashing, it generally implies problems in the computer, the magnitude of which can be ascertained only when the data is recovered.

There are two basic types of damage to the hard disk, physical damage and logical damage. As the name would suggest, physical damage implies actual damage to parts of the computer or the central processing unit. It would comprise of wires, circuitry, chips, fuses, burnouts, etc. It means replacement or repair of parts. Logical damage, on the other hand indicates damage to the file system like incorrect reporting of various functions, system crashes, loss of data, directories gone wrong and other unaccountable discrepancies. Most operating systems come with a basic inbuilt tool kit and are able to repair faults up to a certain level.

A lot of lost data can be found using data recovery or date backup. Backup is very important and even a basic user should regularly implement it. Backup has to be done regularly, checked regularly and the data has to be uncompressed. Data backup has different roles to play. An effective rotation scheme, backup to a remote location and recovery strategy involves use of checksums to avoid making redundant copies. Data can now be salvaged from the backup storage files. There is another feature that ensures effective storage and that is continuous backup where backup is an ongoing process. It is far more effective than traditional backup systems.

Most manufacturers ensure that their product has certain features regarding data recovery and repair of logical systems. Call in a professional and you will be able to retrieve most, if not, all your lost data.

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The data collection business is a 14+ billion dollar revenue creating business in 2009 alone. Data Network Affiliates has created a niche online and offline business opportunity for the individual to create extra income or to create a work from home business. So how does this business work and how does it work for you?

The collection of information as we know is a large and always growing business, with Data Network this business has found its way to you. The opportunity is in the collection of car tags and or, license plates. Why the importance of collecting this information? It can be used to help with children who are missing, stolen cars, and to help banks, car rentals and car dealers in case of stolen property. With this business opportunity you will be helping build this data base of information in the collection of the tags for DNA. The product is literally the tags you collect which are then sold to information collection agencies.

DNA is based in the network marketing and MLM industry. The commission is paid not only on the tags you collect, but also can run 6 levels deep with the individuals you recruit into your business. $2 dollars is paid for each month an individual turns in 20+ tags and $2 for the affiliates that work with you. There are also bonuses of 50% if the tag leads to a reward. The basic break down of compensation is as follows:

you = $2
10 1st level x 20 tags = 200 tags pays you $20
100 2nd level x 20 tags = 2000 tags pays you $200
1000 3rd level x 20 tags = 20000 tags pays you $2,000
10000 4th level x 20 tags = 200000 tags pays you $20,000
100000 5th level x 20 tags = 2,000,000 tags pays you $200,000
1000000 6th level x 20 tags = 20,000,000 tags pays you $2,000,000

The opportunity comes with both a free entry level and a paid level. The difference with the free versus paid will be the tools that you receive with your business. The paid entry level comes with a Builder Website and an Autoresponder system built in to help you recruit your members and build a large business base. Those looking into the paid membership will need to learn how to market effectively their business opportunity on the Internet. Those who take on the free platform will only need to sign up and start collecting.

When looking into any business opportunity online or offline, it is good to do a full due diligence of the opportunity. Overall this is a simple business in which the possibility of making a modest income could be found. Tagging cars will consist of you having to leave home often spending time out in your community collecting license plate numbers and helping others to do the same.

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Online data entry is a great way to supplement ones income. There are several different types of data entry in this day and age. However, due to the economy a lot of people need more then just a little extra income. Many people have lost their jobs or have had there hours cut in half and there are not many full time jobs available since the recession. A lot of people are turning to work at home jobs online for help and the old traditional data entry jobs just don’t generate enough income to cut it. The only way to make above minimum wage is really to look into more of the business opportunities online such as form filling jobs which are commission-based. Although the pay is not hourly, the pay is much better in the long run.

What this type of work entails is simply placing online ads in order to promote online companies and their products. The typist in return gets paid for each and every sale their ad generates. Using specific methods and techniques can generate multiple sales on a daily basis, which adds up to quite a bit of cash in ones pocket. People often get scared away by the term “Sales”, however, this does not mean the typist is actually dong any selling. The companies take care of the actual sales, customer support, delivery and so forth. The typists only job is to do the ad placing which, let’s face it, it doesn’t take a brain surgeon to do it. However, it does take using unique techniques and knowing which products to promote, how to write a successful ad, knowing where to place them and how often. All this information is provided by a training program. These program usually charge a small fee for their services and in return can save you a lot of out of pocket costs on many unsuccessful trial and errors on ones part that doesn’t know what they are doing. For this very reason is why it is definitely worth it to fork out the small fee for this type of guidance and support.

Now finding a good program is another story. There are some that are obviously going to be better then others and there are still scams to be aware of as well. It is always a good idea to do your research when choosing a company to go with rather then just choosing the first company you see. First you could simply run a search on Google for “Home Typing jobs”, or “Data Entry Typing Jobs”. With these keywords, a lot of programs are sure to pop up on the search engines. Then you have the fun part of looking through each program. Don’t always judge a book by it’s cover though. some very well designed sites have turned out to be pretty bad and I’ve seen some of the worst designed sites that actually offer the best program so be wise in making your decision. One good way to check a company out is to simply run a search on their name. This can tell you if they have had any prior complaints.

If you are seriously interested in this type of work, you will want to take a look at Typist jobs. They have an excellent training program and support staff and have been around for quite some time now. To visit Typist Jobs simply visit the link provided below.

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Flash drives can come in very handy when looking to quickly and easily store large amounts of data in a small space. They’re also very convenient if you’re looking to easily move data from one computer to another. Flash drives are typically small, lightweight devices, and are therefore more susceptible to damage, which can lead to losing your data. Here are a 3 simple tips on how to recover data from a flash drive:

Backing Up

The first solution to recovering lost data is to back it up in the first place. Any data you put on a flash drive should be backed up to one or more computers or even an external hard drive. This is more of a solution to prevent you from losing flash drive data in the future and not to recover it; but it’s extremely important to remember.

Flash Drive Data Recovery Software

For those of you who didn’t back up (as is often the case), your first choice should be looking into software to recover your lost data. One of the best products on the market for recovering flash drive data is a program called Klix. Klix is made by a company called ProSoft Engineering, and can assist in recovering files you thought may have been lost forever. Try the trial version first to see if it’s the right fit for you – chances are if you’ve physically damaged the drive, software won’t be of much help to you.

Flash Drive Data Recovery Services

The next option, and more costly, is to hire a data recovery service. If you have a damaged or corrupt drive, hiring a professional service is really your only option to getting your data back safely. Like I said, data recovery services aren’t cheap; on the low end you will be looking at probably $100 just to mail in your device and have them take a look at it. On the high end, you could be paying over $1,000 just to get your data back. It all comes down to how much your lost data is worth to you!

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Data recovery is the best option you have at hand in the event that your hard drive crashes. By hiring the services of a data recovery expert, you stand a chance of recovering a big part of the data you lost, if not all of it.

You should not panic when your drive crashes, and neither should you do anything that may worsen your problem. If you act quickly and with a clear head, it is even possible that you may be able to fix the problem yourself without turning to a hard drive recovery specialist.

There are things that you should do and should not do in the event of a drive crash. You can read them below.

Things to Do When Your Hard Drive Crashes

You will know that your drive has crashed or is about to crash when you hear loud grinding or clicking sounds coming from your computer tower. However, it is also possible for your computer not to be able to read the hard disk without any obvious reasons.

When your computer cannot detect your drive and you do not see or hear any telltale sign as to why, here is what you should do:

1. Check if the connections of the disk cables and the power cables are where they should be.

2. See if the disk configuration is correct.

3. Try to access the crashed drive using another controller interface or adaptor. You can also try to see if another computer will be able to read the hard drive.

Things NOT to Do When Your Hard Drive Crashes

Just as there are things that you need to do when your drive crashes, there are also a few things that you should never do. Otherwise, you will only worsen the problem and increase the chances of all that data you need to have recovered being lost. Here they are.

1. Do not boot up your computer if it is obvious that your hard drive has a physical problem. If the grinding or the clicking is really loud, quit trying to start up your computer.

2. Do not attempt to repair your drive by yourself using data recovery freeware you have downloaded from the Internet, especially if you do not really know what you are doing. Using data recovery freeware without determining exactly what happened to your hard drive will only worsen your problem and increase the probability of you not being able to retrieve any bit of data from your drive.

Data Recovery Is Your Best Option

As soon as you have determined that your hard drive crashed and there is nothing that you yourself cannot do to reverse the problem, you should call a data recovery expert right away. A data recovery expert will determine the exact cause of the crash and perform the appropriate solution to the problem. You should be prepared when you give your hard drive to a drive recovery expert because the service can be expensive and time-consuming.

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Planning, creating, and building a data centre can be one of the most expensive tasks an IT director can face. In order to maximize cost effectiveness and achieve optimum performance, reliability is key.

Data centre size can range from one room in an office to an entire building, but there are some basic requirements which must be implemented to ensure system reliability. When designing a data centre, efficient planning is very important. A number of areas must be addressed to ensure a dependable and efficient system which is capable of continued operation.

Understand the potential causes of failure

There are a number of areas cited as the most common causes of data centre failure:

o Environmental problems

o Software failure – for example, memory leaks

o Hardware failure – such as storage or processing problems

o Operator or procedural error

o Poor network reliability

o Security breaches – for example hacker attack

Environmental considerations

When planning a data centre, there are a number of physical and architectural design features which must be implemented to ensure reliability:

o Adequate Air Supply: temperature must be maintained between 20 and 25 ºC and humidity between 40 and 60 %. Too much humidity can cause water to condense on internal components. However if the air is too dry, this can cause static electricity to discharge. Malfunction is likely if the above ranges are not maintained. This is one of the prime causes of data centre malfunction. Implementation of adequate air conditioning and correct architectural design to allow for air circulation between units is vital. Particular care needs to be taken to prevent “hotspots” from occurring.

o Safeguard against power loss: external environmental factors such as hurricane or snowstorm can cause power black outs. It is vital to have a generator to ensure continued function, as well as an uninterruptible power supply (UPS) for emergency power. These should be of sufficient size to power cooling systems.

o Fire protection systems: the simplest forms of fire protection are smoke detectors, for early detection of a fire. It is also vital to ensure fire containment to prevent the spread of a fire to the entire data centre. For example: Contained sprinkler systems or gaseous fire suppression.

Software, hardware or network failure

Tested and quality assured hardware and software from reputable brands can help increase reliability. Common malfunction in one component, such as an internal fan or storage disc, can quickly lead to failure in another. Ensuring network performance and reliability can also have a huge impact on the performance of the data system.

Operational procedures

It is impossible to completely rule out human error and operational issues. However, devising an operations procedure to not only maximize performance but also track reliability and malfunction is key. Conduct regular back-ups on each production server to ensure quick file repair in the event of damage. Provide adequate operator training to implement protocol and avoid the most basic of errors such as leaving discs in drives, which would prevent an auto-reboot in the event of system failure.

Data security

Particularly important in large data centres with sensitive information, is to ensure adequate physical security. Corporations may consider outsourcing their data centre to an off-site location with 24 hour security guards and video surveillance. System security also requires keeping up-to-date with the latest security and anti-virus software.

Avoid single point of failure

One final key consideration is to avoid having a single point of failure. Test the system before it goes operational and ensure that if one component fails there is sufficient backup to ensure the data centre can still function. Back-up will make sure that your important data is never lost.

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If you have already been searching for online data entry jobs, you know that most opportunities are scams. With the growth of the internet and the state of the economy, many people are out to make money – and leave you with worthless opportunities that won’t make you a dime. Are there really data entry work from home opportunities available that are legitimate? Definitely. This article will explain more about the various options available.

While it is tough to find a company online that wants you to perform simple data entry tasks, there are many easy ways you can make money in this field. Some sites charge a nominal membership fee and provide you with thousands of opportunities and job listings.

Recently, thousands of people have turned to online data entry jobs that are supplied by these membership sites. These sites provide you with the software, support and training at no extra cost. You simply post short data submissions online, and make real money. The more time you have to commit to these programs, the more money you will make.

Data entry work from home is one of the most popular ways to earn money on your computer. Most of these positions require no previous experience and are available all over the world. If you can type and have an internet connection, you can perform these easy tasks.

These companies offer global work at home opportunities as well as traditional options. The global opportunities pay more than the traditional, but you will make a comfortable living with either. Traditional data entry work from home jobs include clerical transcription, phone transcription and data recording. These pay well, but not as well as the global opportunities.

If you have searched for real opportunities on the internet, you know they are hard to find. We have found the best legitimate online data entry jobs available, and now you can know the secret as well! Get started today, and you will be making money tomorrow from the comfort of your own home.

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Because of data recovery solutions available today, a crashed drive does not have to be a moment of trauma for you. There are possible solutions you can turn to in order to get back the data that you lost, and if you act immediately, it is possible for you to have at least 80% of that data back.

Of course, preventing a hard drive crash is still the best solution to drive failure. Failing that, here are possible hard drive recovery solutions you can turn to in the event that your hard disk gives out on you.

Data Recovery Using Third-Party Software

If you are a person who knows his or her way around computers, you can attempt to perform the recovery yourself. You can do this with the help of third-party recovery software. What these pieces of software do is to help repair what logical errors caused your hard drive to fail and then try to retrieve the data stored in the bad sectors of the drive.

Although there are freeware out there that you can use to get your data back, you have a better guarantee of getting the job done with proprietary software. Still, the use of third-party software to perform your data recovery is very risky.

You should not attempt to do this if you are not that knowledgeable about computers. Otherwise, you will end up wasting precious time and money, and you stand the chance of losing all your data altogether.

Hiring Data Recovery Services

The best way to get your lost data back by far is hiring the services of a data recovery engineer. These recovery engineers are experts in their field. They investigate the cause of the hard drive error and then perform the appropriate measures.

Sometimes, in order to recover the data lost in the hard drive crash, a data recovery engineer may take your hard drive apart to repair whatever mechanical errors that caused it to crash. Sometimes, they may just use software that they have developed themselves. Anyhow, industry standards call for them to retrieve for you at least 80% of your lost data.

It is no secret that data recovery services can be quite expensive. Still, data recovery engineers know their job well and can be relied upon to do it, no matter how complicated the task is.

Preventing Hard Drive Crashes

Of course, the fact remains that the best way to deal with hard drive crashes is to prevent them from happening in the first place. It is actually easy to get this done. All it takes is for you to make it a habit to back up your files frequently, to defragment your hard drive regularly, and to implement measures such as protecting your computer with power surge regulators.

Data recovery is a lifesaver in that you can expect to get at least part of your data back. However, an ounce of prevention is still better than a pound of cure.

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