Although their formulas are similar, one primary difference between a z-score (z) and a t-statistic (t) is that the ______ of the formula for the t-statistic contains or involves ______.
a. denominator; a sample mean 
rather than the population mean (?)
b. numerator; a sample mean 
rather than an individual score (X)
c. numerator; the variability of individual scores (Xs) rather than sample means 
d. denominator; the population mean (?) rather than a sample mean 
b. numerator; a sample mean 
rather than an individual score (X)
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