7.3-2 Suppose the 100 hospital discharges on the hospital charges worksheet in Chpt 4-1.xls represent a random sample of all Medicare-eligible persons discharged from a specific hospital.

a. Test the null hypothesis at the 95 percent level of confidence that average charges for the population is $6000(H0:C=6,000) against the alternative hypothesis that average Charges is not $6,000 (H1: C=/$6000) and state your conclusion

b. Test the hypothesis at the 99 percent level of confidence, and state your conclusion

c. Test null hypothesis at the 95 percent level of confidence that average LOS for the population is 7.5 days (H0: LOS=7.5) against the alternative hypothesis that LOS is not 7.5 (H1: LOS=/7.5), and state your conclusion.

d. Test the same hypothesis at the 99 percent level of confidence, and state your conclusion