A researcher reports “the average patron (n = 22) in a local bar consumed more than twice the number of drinks (per day) on weekends (M = 5.4 drinks) compared to weekdays (M = 2.3 drinks).” Although not stated directly, how do we know that the patrons in this study constitute a sample and not a population of patrons at this local bar?
A. We can't know for sure because this was not stated directly.
B. The notation for a sample mean was used.
C. The notation for a sample size was used.
D. Both the notation for a sample mean was used and the notation for a sample size was used.
Ans: D
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