For the data set listed, use Excel to extract the mean and standard deviation for the sample of lengths of stay for cardiac patients.

Suppose that a health plan assertsthat a patient hospitalized withcoronary heart disease requiresno more than 6.5 days ofhospitalcare.However,we believe that astay of6.5 days is too low.To ex-amine the claim ofthe healthplan,assume further that we col-lected data depicting the lengthsofstay of40 patients who werehospitalized recently with coro-nary heart disease.The results of the sample are as follows:

5,8,9,12,7,9,10,11,4,7,8,5,8,13,11,10,6,5,8,9,

5,12,7,9,4,8,7,7,11,5,8,10,5,8,2,11,3,6,8,7

If a 0.05,use these data to evaluate the claim by the healthplan.