A test of sobriety involves measuring the subject's motor skills. Twenty sober subjects are randomly selected...

A test of sobriety involves measuring the subject's motor skills. Twenty sober subjects are randomly selected from a population having a normally distributed motor skills test scores. For the sample, the mean score was 41.0 and the standard deviation was 3.7.

a. At the 0.01 level of significance, test the claim that the true mean score for all sober subjects is equal to 35.0. Use both the Rejection Region and the P-value methods.

b. After stating your conclusion, provide a 99% confidence interval for the mean motor skills score. Show all working!

c. Write a one-sentence interpretation of your interval and explain how the interval can be used to test the hypothesis above.

Solutions

Expert Solution

conclusion: - their is no sufficient evidence to support the claim that "mean score for sober subjects is equal to 35."

orchestra answered 1 year ago

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