The American Hospital Association reported that in 2015 the mean cost per day per patient in the U.S. is $1453. A random sample of 22 Pennsylvania hospitals had a mean cost of $1523 per day with a...

The American Hospital Association reported that in 2015 the mean cost per day per patient in the U.S. is $1453. A random sample of 22 Pennsylvania hospitals had a mean cost of $1523 per day with a standard deviation of $197.  Test to see if the mean cost of Pennsylvania hospitals is higher than the mean overall in the U.S.      (use α  = .05)

a. State the null and alternative hypothesis.

b. Compute the test statistic.

c. Write your conclusion in a sentence.