A Researcher in Sports Psychology Is Interested in the Resting $\pm$

Multiple Choice

A researcher in sports psychology is interested in the resting pulse rate of long-distance college runners.She does some research and finds data from the U.S.Olympics team showing their long-distance runners have a resting pulse rate of 60 beats per minute.She wants to know if the pulse rate for college runners is different from the Olympic team's m of 60.She randomly samples 20 long-distance runners,and finds
Using a nondirectional test with a = .05,what are your critical values?

A) $\pm$ 2.093
B) $\pm$ 2.086
C) $\pm$ 1.729
D) $\pm$ 1.725