Aphysiologistbelieveshehasdiscoveredanewsteroidhormonethatcancontrolthebloodglucoseinmammals.Inanexperimentheinjectslaboratoryratswithasmallamountofthissteroidhormoneand,afterasuitablewaitingperiodmeasuresthebloodglucoseleveloftherats.Inhistwelveexperimentalratsheobtainsthefollowinglevelsofbloodglucose{35,36,21,33,34,35,33,35,37,36,38,35}.Frompreviousstudiesofthousandsofnormal,unmanipulatedratsheknowsthatthemean(mu)bloodglucoselevelinthisspeciesofrat(hislaboratorypopulation)is32andthatthestandarddeviationis1.15.Evaluatethehypothesisthatthisnewsteroidhormonedecreasesbloodglucoselevels.Useanalpha-levelof0.01forthisanalysis.

1- What is the appropriate test?

2- What is the null hypothesis?

3- What is the alternative hypothesis?

4- Find the critical value:

5- Calculate the obtained statistic: