(Answered) MATH399N Week 7 Conduct a Hypothesis Test for Mean – Population Standard Deviation Known – Critical Value/Rejection Region Approa

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Determine the critical value or values for a one-mean z-test at the 10% significance level if the hypothesis test is left-tailed (Ha:μ<μ0).

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Determine the critical value or values for a one-mean z-test at the 20% significance level if the hypothesis test is left-tailed (Ha:μ<μ0).

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Based on the results of the company’s hypothesis test regarding their market share estimate, choose the correct conclusion that interprets the results within the context of the hypothesis test.

Select two responses below.

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The mean math SAT score for seniors at Blue Moon High School is 560. An investigator believes that this score is different than the national average. After obtaining all relevant data, she conducted a hypothesis test using a significance level of 5%.

Determine the critical value or values for a one-mean z-test at the 5% significance level if the hypothesis test is two-tailed (Ha:μ≠μ0).

Use the curve below to show your answer. Select the appropriate test by dragging the blue point to a right-, left- or two-tailed diagram. The shaded area represents the rejection region. Then, set the critical value(s) on the x-axis by moving the purple slider on the right.

 Answer:

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Wrenley, a student midwife, predicts that the gestation periods among the population in her city are lower than the average 280 days due to pollution. She conducted a hypothesis test using a significance level of 5%.

Determine the critical value or values for a one-mean z-test at the 5% significance level if the hypothesis test is left-tailed (Ha:μ<μ0).

Use the curve below to show your answer. Select the appropriate test by dragging the blue point to a right-, left- or two-tailed diagram. The shaded area represents the rejection region. Then, set the critical value(s) on the x-axis by moving the purple slider on the right.

 

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Based on Hugo’s study outcomes regarding his pitch speed, choose the correct conclusions that interprets the results within the context of the hypothesis test.

  • Select all that apply.

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