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. A switch from using a two-tailed test to a one-tailed test A. Decrease B. Increase C. Stays the same An increase in the population variance (σ²) A. Decrease B. Increase C. Stays the same An increase in the significance level (such as using α = .05 instead of α = .01) A. Decrease B. Increase C. Stays the same A decrease in the sample size (n) A. Decrease B. Increase C. Stays the same Suppose you fail to reject the null hypothesis. Then, the results of your study are _______ A. Significant B. Not significant 7. Factors that influence a hypothesis testSuppose you conduct a hypothesis test about a population mean when the standard deviation is known (a "z test") by calculating a z statistic anddetermining 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 isvery 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 ResultsThe z statisticA switch from using a two-tailed test to a one-tailed testAn increase in the population variance (ơ²)An increase in the significance level (such as using a = .05 instead of a = .01)A decrease in the sample size (n)Suppose you fail to reject the null hypothesis. Then, the results of your study are

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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.

A switch from using a two-tailed test to a one-tailed test

A. Decrease

B. Increase

C. Stays the same

An increase in the population variance (σ²)

A. Decrease

B. Increase

C. Stays the same

An increase in the significance level (such as using α = .05 instead of α = .01)

A. Decrease

B. Increase

C. Stays the same

A decrease in the sample size (n)

A. Decrease

B. Increase

C. Stays the same

Suppose you fail to reject the null hypothesis. Then, the results of your study are _______

A. Significant

B. Not significant

7. 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
A switch from using a two-tailed test to a one-tailed test
An increase in the population variance (ơ²)
An increase in the significance level (such as using a = .05 instead of a = .01)
A decrease in the sample size (n)
Suppose you fail to reject the null hypothesis. Then, the results of your study are

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