(1 point) A random sample of 100 observations from a population with standard deviation 7.22257393008022 yielded a sample mean of 91.2. (a) Given that the null hypothesis is u = 90 and the alternative...

Extracted text: (1 point) A random sample of 100 observations from a population with standard deviation 7.22257393008022 yielded a sample mean of 91.2. (a) Given that the null hypothesis is u = 90 and the alternative hypothesis isu > 90 using a = .05, find the following: (i) critical z score (ii) test statistic = (b) Given that the null hypothesis is u = 90 and the alternative hypothesis is u + 90 using a = .05, find the following: (1) the positive critical z score (ii) the negative critical z score (iii) test statistic =