Read the problem below then answer the questions that follow:
A health specialist wants to determine the average number of hours a person exercise in a day during the quarantine period. She found out that the mean number of hours a person exercise in a day during the quarantine period is 80 minutes. A random sample of 36 persons were surveyed and found that their mean is 65 minutes and a standard deviation of 20 minutes. Test the hypothesis at 5% level of significance and assume that the population is normally distributed.

Which of the following is the appropriate mathematical form for the alternative hypothesis?

a. = 80 minutes
b. < 80 minutes
c. ≠ 80 minutes
d. > 80 minutes