Hello, I need help with this question (the options are INCREASE, DECREASE or STA

Question

Hello, I need help with this question (the options are INCREASE, DECREASE or STAYS THE SAME) the ones i put i just guess i don't know if they are correct.

and the last fill in the black is either SIGNIGICANT or NOT SIGNIFICANT

8. Factors that influence a hypothesis test Aa Aa 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 righthand column to indicate your choice. Change in Study Design or Results The z statistic A switch from using a two-tailed test to a one-tailed test Increases Decreases A decrease in the population variance (oz) A decrease in the significance level (such as using a = .01 instead of a = .05) Stays the same A decrease in the sample size (n) Decreases Suppose you reject the null hypothesis. Then, the results of your study are

Explanation / Answer

A switch from using a two-tailed test to a one-tailed: The Z-statistic decreases

A decrease in the population variance:  The Z-statistic increases

A decrease in significance level: critical value changes but The Z-statistic stays the same

A decrease in sample size: The Z-statistic decreases

Suppose you reject the null hypothesis. Then the results of your study are significant.

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