Prelim 2 Review
D&B Chapters 8, 9, 10, and 12
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How are populations
characterized?

Mean
z
Central tendency

Variance
z
Spread

Standard deviation
z
Spread (in units of the mean)

Standard error
z
Variation of the mean
How might we see if a
population is different from
what we might expect?

Compare a mean to some
hypothetical value
(one sample test)

Compare a mean of one population to
the mean of another
(two sample test)

Compare several means
(ANOVA)

Compare means (predictions) across
a range of predictor values
(Regression)
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