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.