Question

in the past, the mean running time for a certain type of flashlight battery has been 8.1 hours The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has changed as a result.

a. Two Tailed

b. Left Tailed

c. Right tailed

Question 2

In the past, the mean running time for a certain type of flashlight battery has been 9.0 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. The hypotheses are: H 0: μ = 9.0 hours H a: μ > 9.0 hours

where μ is the mean running time of the new batteries
Suppose that the results of the sampling lead to rejection of the null hypothesis. Classify that conclusion as a Type I error, a Type II error, or a correct decision, if in fact the mean running time has not increased.

A. Correct Decision

B. Type II error

C. Type I error

question 3

A researcher is interested in comparing the resting pulse rate of women who exercise regularly and women who do not exercise regularly. She wants to perform a hypothesis test to determine whether the mean resting pulse rate of women who exercise at least 6 hours per week is less than the mean resting pulse rate of women who exercise less than 6 hours per week.

A. Two tailed

B. Left Tailed

c. right tailed

Answer 1