Testing when we know the answer Create 15 random numbers that are normally distributed with mean 10 and s.d. 5. Use MINITAB to find a 1-sample z test at the 95% level. Did it get it right?

The t-test The $t$-test is just as easy to do in MINITAB. Do a $t$-test on the same data. Is it correct now? Comment on the relationship between the confidence intervals.

Real data Download the data set Rat from Kitchen’s site. Do a $t$ test for mean if the data suggests it is appropriate. If not, say why not.

Real data II Do the same for the data set Puerto (weekly incomes of Puerto Ricans in Miami.).

C.I. for the median The median may be the appropriate measure of center. If so, you might want to have a confidence interval for it too. MINITAB has the 1-Sample sign test available. TO find it go to Stat->Nonparamterics->1-sample sign and go from there. Try it out on the data set Malpract (on the size of malpractice awards).