Level 111
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frequency distribution

the organized raw data list of the number of times or frequencies with which each score occurred and the percentage of times that it occurred

Qualitative variables

Are categorical, e.g., bond rating, convertible, callable

Quantitative variables

Are measured by real numbers, e.g., numerical measurement: coupon rate on a bond.

Measures of Distributions

center or central tendency

leptokurtic

highest peakedness

mesokurtic

middle peakedness

platykurtic

lowest peakedness

mean

center of a distribution

median

middle score in a distribution

M

Money

mode

value that appears the most

bell-shaped normal distribution

when is the mean, median, and mode the same?

Nomothetic

Test that assesses variables people share

ideographic

individual differences

range

highest score minus the lowest score

IQR

measure of variability that represents the range of the middle half of the data

No

Can test scores be valid but not reliable?

John Tukey

who called Q1 and Q3 the upper hinge and the lower hinge and the IQR the H-Spread?

median absolute deviation

what is very robust to outliers which means not sensitive

Variance

the square of the standard deviation, i.e., SD(2)

adjusting the denominator to n-1

what makes the variance an unbiased estimator?