## Statistics: average waist size of men in America

Tutoring statistics, questions arise from it.  The tutor begins a discussion about some recent findings. Twenty years ago I sold suits.  A good deal of customers had 38″ or 40″ waists.  However, there were more men smaller than that, rather …

## Statistics: why the median might sometimes be preferred over the mean

Tutoring statistics, you talk about the median vs the mean.  While the mean is probably used more (because of its involvement in the normal distribution), the median is preferred in some applications…. Back in my May 6 post, I briefly …

## Statistics: the normal distribution

Tutoring statistics, you help students who, in many cases, are facing completely new ideas (to them).  The tutor continues his goal of explaining statistics from a “day-to-day” point of view. In an introductory stats course – which is probably as …

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## 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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## Mean, median, and mode

Tutoring high school math, you deal with introductory statistics.  The tutor introduces measures of central tendency. Let’s imagine you have the following seed counts from eleven different apples: 15 9 8 10 8 10 8 5 7 14 12 We …

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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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## Statistics: standard deviation with the Casio fx-260Solar

Tutoring Math Foundations 11, standard deviation is front and centre right now.  The tutor continues explaining the standard deviation function on various scientific calculators. Like the Sharp EL-520W, the Casio fx-260Solar requires you to set the mode to use its …

## Statistics: Calculating the standard deviation using the Sharp EL-520W

Tutoring math, you get asked about statistics.  The tutor offers an article which might be of interest to stats students. Calculating standard deviation by hand can be laborious.  Keeping track of what you’ve entered, making sure the brackets have been …

## Math: Expected Value

Tutoring math, you might be asked about statistics, in which expected value is an early topic. In many everyday situations, the expected value is equal to the mean, aka the average.  The difference is more in definition than in practice.  Expected value involves probability, whereas mean …