Test and Measurements, Appendix A part 1

The three measures of Variability are

Range, Standard Deviation, and Variance

Standard deviation

Average amount of variability in a set of scores; Also classified as average distance from mean a set of scores are

Variance and Standard deviation relationship

Variance is just essentially standard deviation squared

What happens if the standard deviation is 0?

This would indicate an identical average set of scores, tho extremely rare

If the Standard Deviation is large, what is the correlation with said values?

This would indicate a More spread output of values

The first characteristic of a normal bell curve is?

It represents a Distribution of values, so the mean, mode, and median are equal to one another

The second characteristic of a normal bell curve is?

Perfectly symmetrical about the mean

The third normal characteristic of a bell curve is?

The tails of the curve are asymptotic

Asymptotic

This means that the graph will never touch the axis