Use theone-standard-deviation2-testand theone-standard-deviation2-intervalprocedure to conduct the required hypothesis test and obtain the specified confidence interval for a sample of size

n=28with a standard deviation ofs=7.

a.H0:=4,Ha:>4,=0.05

b.90%confidence interval

a. Compute the test statistic._______

(Round to three decimal places asneeded.)

Find the criticalvalue(s).______

(Round to three decimal places as needed. Use a comma to separate answers asneeded.)

Make a conclusion based on these results. Choose the correct answer below.

A.DonotrejectH0.The test statistic islessthanthe critical value.

B.RejectH0.The test statistic isgreaterthanorequaltothe critical value.

C.DonotrejectH0.The test statistic isgreaterthanorequaltothe critical value.

D.RejectH0.The test statistic islessthanthe critical value.

b. The90%confidence interval is from _____to ______.

(Round to three decimal places asneeded.)