The mean age of professors at the university is 55.3 years. If hypothesis test is carried out, how should you interpret a decision that fails to reject the null hypothesis?
a. There is not sufficient evidence to reject the claim mu is 55.3
b. There is sufficient evidence to reject the claim mu is 55.3
c.There is not sufficient evidence to support the claim mu is 55.3
d. There is sufficient evidence to support the claim mu is 55.3