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

Question

Quizplus · Accepted Answer

The z-score is used for individual scores to determine how many standard deviations an element is from the mean, while the t-statistic is used to analyze the difference between sample means, especially when the population standard deviation is unknown and the sample size is small.

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