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 …

Windows 7: accessories: the calculator: standard deviation Read more »

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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 …

Standard deviation: a forestry example Read more »

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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: standard deviation shortcut using frequencies Read more »

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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: what is a z-score? Read more »

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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: an easy estimate of the standard deviation Read more »

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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 …

Statistics: the meaning of mean and standard deviation Read more »

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