The U.S Agency for Healthcare Research and Quality reports that in 2015, the mean cost of a stay in the hospital for American women aged 18-44 was $14,200 with a population standard deviation of $51,600. Test whether the mean cost has changed since 2015 using an a=0.01

a) State the hypothesis and identify the claim

b) find the critical value

c) compute the test value

d) determine the P-value

e) make the decision to reject or not reject the null hypothesis

f) summarize the results


part 2
construct the 99% confidence interval for the mean cost if a stay in the hospital for American women aged 18-44 using the sample data from problem one and the same population standard deviation