data are as follows:a) construct a 95 percent confidence interval estimate of alpha2.b) Test the hypothesis that alpha2=1 . What are your conclusions?

Twenty observation on etch uniformity on silicon wafers are taken during a qualification experiment for a plasma etcher. The data are as follows:a) construct a 95 percent confidence interval estimate of alpha2.b) Test the hypothesis that alpha2=1 . What are your conclusions?