Attempts 1.3 Keep the Highest 1.3/2 9. Factors that influence a hypothesis test Suppose you conduct a hypothesis test about a population mean when the standard deviation is known (a "z test") by...

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Extracted text: Attempts 1.3 Keep the Highest 1.3/2 9. Factors that influence a hypothesis test Suppose you conduct a hypothesis test about a population mean when the standard deviation is known (a "z test") by calculating a z statistic and determining whether to reject the null hypothesis. Assume that your z statistic is a positive value and that you will reject the null hypothesis when z is very large. Listed below are possible changes to the study design or to the results of the study. Determine whether the z statistic increases, decreases, or stays the same for each of these changes. Use the dropdown menus in the right-hand column to indicate your choice. Change in Study Design or Results The z statistic An increase in the significance level (such as using a = .05 instead of a = .01) Decreases An increase in the population variance (o²) Stays the same An increase in the obtained difference (M - H) Decreases A switch from using a two-tailed test to a one-tailed test Increases Suppose you reject the null hypothesis. Then, the results of your study are