Objectives Understand the definitions used in hypothesis testing. State the null and alternative hypotheses. Find critical values for the z test. State the five steps used in hypothesis testing. Test means for large samples using the z test. Test means for small samples using the t test. Objectives (cont'd.) Test proportions using the z test. Test variances or standard deviations using the chi square test. Test hypotheses using confidence intervals. Explain the relationship between type …showed first 75 words of 1532 total…

…showed last 75 words of 1532 total…occur when the null hypothesis is not rejected when it is false. One can test a single variance by using a chi-square test. Conclusions Researchers are interested in answering many types of questions. For example: "Will a new drug lower blood pressure?" "Will seat belts reduce the severity of injuries caused by accidents?" These types of questions can be addressed through statistical hypothesis testing, which is a decision-making process for evaluating claims about a population.