A researcher measures the amount of coffee consumed by college students while studying during the final exam week.In her study,she found that students drink 2.3±0.8 (M±SD)cups of coffee per study session.Assuming the data are normally distributed,which of the following is the most appropriate conclusion?
A)The average student drinks less than 2.3 cups of coffee per study session.
B)Most students drink between 1.5 and 3.1 cups of coffee per study session.
C)Most students drink between 2.3 and 3.9 cups of coffee per study session.
D)Most students drink between 0.7 and 2.3 cups of coffee per study session.

Question

Quizplus · Accepted Answer

Since the data is normally distributed, we can use the empirical rule to determine the range in which most of the data falls. According to the empirical rule, approximately 68% of the data falls within one standard deviation of the mean. Therefore, most students drink between (2.3-0.8) = 1.5 and (2.3+0.8) = 3.1 cups of coffee per study session. Choice B is the only option that falls within this range, so it is the best choice.

A Researcher Measures the Amount of Coffee Consumed by College