4. Monkeypox is a disease caused by a virus in the same family as smallpox. The incubation period for monkeypox is 7-14 days with an average incubation period of 10.5 days. Assume that all monkeypox cases have approximately normally distributed incubation periods with a standard deviation of 2 days. A prospective cohort study was conducted that followed 100 people in an area at high risk for monkeypox. 75 people ended up contracting monkeypox and they found that in this group, the average incubation period was 12 days. Using a significance level of 0.01, test the claim that the average incubation period for monkeypox of those in the study is different than 10.5 days and select the correct conclusion. a. Z = 6.5 > 2.575, therefore we fail to reject the null hypothesis that the incubation period of those in the study is equal to 10.5 days. b. Z =6.5 > 2.575, therefore we accept the null hypothesis that the incubation period of those in the study is equal to 10.5 days c. Z = 6.5 > 2.575, therefore reject the null hypothesis that the incubation period of those in the study is equal to 10.5 days. d. Z=6.5