## Windows 7: accessories: the calculator: standard deviation

The tutor brings up another great find from the Windows Start menu. I’ve rediscovered the Windows 7 calculator. It can be opened by typing calc.exe into the search box (Start Menu), or else at the Command Prompt. It’s also available …

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## Standard deviation: a forestry example

The tutor offers a case study in statistics. Around here, forestry might be the leading industry.  Of course, I hardly ever see evidence of it; up in the hills is where the work is done. As I understand, one angle …

## Statistics: standard deviation shortcut using frequencies

The tutor shows a convenient way to estimate the standard deviation. Let’s imagine the following list of 20 test scores: 43, 44, 49, 51, 52, 55, 57, 58, 61, 64, 68, 73, 74, 76, 77, 82, 84, 85, 87, 91 …

## Statistics: what is a z-score?

Tutoring some high school math courses, statistics is prominent.  The tutor introduces an important definition.   Statistics focuses on the mean and the standard deviation. But why is that? The reason is that while most phenomena follow a normal distribution, …

## Statistics: an easy estimate of the standard deviation

Tutoring statistics, I’m happy to add this method to my repertoire.  The tutor brings forth a shortcut for finding the standard deviation. According to my source listed below, the standard deviation (σ) can be estimated as follows: σ=range/6 The range …

## Statistics: the meaning of mean and standard deviation

Tutoring math, you get asked about statistics.  The tutor offers an interpretation of mean and standard deviation. Back when I was in university, there was a 2nd-year statistics course. It was the introductory stats course and was required for many …

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## Statistics: Standard deviation on the TI-30XA

Tutoring math or statistics, you need to be familiar with various common scientific calculators. The math tutor continues the standard deviation series with a look at how to do it on Texas Instruments’ TI-30XA. Unlike the Sharp EL-520W or the …

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