Although Their Formulas Are Similar, One Difference Between the Z-Score

Multiple Choice

Although their formulas are similar, one difference between the z-score (z) and the t-statistic (t) is that ______.

A) only the denominator of the z-score formula (not the t-statistic) is a measure of variability
B) z-scores evaluate sample means whereas t-statistics evaluate individual scores
C) only the numerator of the z-score formula (not the t-statistic) is the difference between means
D) the z-score evaluates individual scores whereas the t-statistic evaluates sample means