Sleep researchers theorize that 25% of the general population suffers from obstructive sleep apnea. Researchers found that 124 of 159 emergency room nurses suffered from obstructive sleep apnea. We aim to test the hypotheses that emergency room nurses differ (i.e., not equal) from the general population proportion. The appropriate test statistic to test the hypotheses is _____.

Select one:

a. 15.43

b. -16.13

c. 16.13

d. -15.43

e. 13.63