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Level 112

Statistical Analysis & Characteristics of Distribu


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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?