The appropriate procedure for testing, at significance level o, the null hypothesis H:p r against the alternative hypothesis H,: <. uses the following decision rule: reject h hypothesis testing: single population equivalently. u53 woject i where is number for which piz-2 and z standard normal random variable. in addition p-values can be computed by using lower-tail probabilities. example ball bearing production test manager of twin forks inc. has asked your assistance evaluating a modified process. when process operating properly produces bearings whose weights are normally distributed with mean ounces deviation ounce. new raw-material supplier was used recent run wants to know if that change resulted lowering weight bearings. there no reason suspect problem man- ager will continue use unless strong evidence under being produced>