Author Question: A test of sobriety involves measuring the subject's motor skills. Twenty randomly selected sober ... (Read 92 times)

kwoodring · **on:** Aug 1, 2018

A test of sobriety involves measuring the subject's motor skills.

Twenty randomly selected sober subjects take the test and produce a mean score of 41.0 with a standard deviation of 3.7. At the 0.01 level of significance, test the claim that the true mean score for all sober subjects is equal to 35.0.

Question 2

If r(20) = +.21, p > .05 for variables X and Y, then the best prediction of a Y score from an X score is .

a. the value of X
b. the value of X - Y
c. the value of Y
d. 1.00

prumorgan · **Reply #1 on:** Aug 1, 2018

Answer to Question 1

Test statistic: t = 7.252. Critical values: t = -2.861, 2.861. Reject the null hypothesis. There is sufficient evidence to warrant rejection of the claim that the mean is equal to 35.0.

Answer to Question 2

C