For #9 and #10 apply critical value (rejection region) method for the following Hypothesis testing of a single population mean: Null Hypothesis Ho: =...

For #9 and #10 apply critical value (rejection region) method for the following Hypothesis testing of a single population mean:

9. Null Hypothesis Ho: μ = 200

Alternative Hypothesis H1: μ ≠ 200 (Two-Tailed test)

In a random sample of 100 subjects, the sample mean found to be x̅ =220.

Population standard deviation is σ=50. Significance level is α = 0.10

Calculate test statistics

For the given significance level α = 0.10, find critical values (use attached table for Normal Distribution)

10. Draw the line for z-scale and use critical values to identify rejection region (shade these portions)

Mark position of test statistics on your z-scale.

Does test statistics fall in the rejection region?

Will you reject or do not reject Ho?