In One Sample Proportion test, it is important to convert the sample proportion to a z-score first. In this example, we selected a random sample of size 130 from a pool of university students and asked whether they use the university gym on a regular basis. Ninety replied yes. Assuming that the population proportion under the null hypothesis is 50%, what is the z-score for the sample proportion?

Group of answer choices

a. 2.63

b. 3.27

c. 4.39

d. 3.38