1. Twenty male athletes were given a special candy bar daily forseveral weeks, and each man’s body weight was recorded. It is foundthat the mean change in body weight was +1.5 kg. The variance ofthese 20 data of weight-change has been estimated as s2 = 6.25 kg2.(50 pts) – t distribution and chi-square distribution tables areincluded.
(a) Test the null hypothesis that the candy bar has NOsignificant effect on body weight.
(b) Test the null hypothesis that the candy bar will havepositive impact on the body weight
change.
(c) Test the null hypothesis that H0: ?2 = 3.00 kg2
(d) Test the null hypothesis that H0: σ2 ≥ 5.00 kg2
