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 sample size was used.
d. The notation for both a sample mean and a sample size was used.
Answer: D
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