Use the following information to answer the question. Can deep- knee bends help you stay alert in class? Forty subjects were measured for alertness at the beginning of class then voluntarily performed fifteen deep- knee bends followed by a forty- five minute lecture. Each subject was then measured for alertness at the end of the lecture. The hypothesis test results for the sign test are summarized below. Assume that all conditions for testing have been met:

-Using a significance level of 5%, state the correct decision regarding the null hypothesis and concluding statement.
A)Reject H0. There is evidence to suggest that there is difference in alertness after deep knee bends before the lecture.
B)Fail to reject H0. There is evidence to suggest that there is a difference in alertness after deep knee bends before the lecture.
C)Fail to reject H0. There is evidence to suggest that there is no difference in alertness after deep knee bends before the lecture.
D)Reject H0. There is evidence to suggest that there is no difference in alertness after deep knee bends before the lecture.

Question

Use the following information to answer the question. Can deep- knee bends help you stay alert in class? Forty subjects were measured for alertness at the beginning of class then voluntarily performed fifteen deep- knee bends followed by a forty- five minute lecture. Each subject was then measured for alertness at the end of the lecture. The hypothesis test results for the sign test are summarized below. Assume that all conditions for testing have been met:
 
-Using a significance level of 5%, state the correct decision regarding the null hypothesis and concluding statement.
A)Reject H0. There is evidence to suggest that there is difference in alertness after deep knee bends before the lecture. 
B)Fail to reject H0. There is evidence to suggest that there is a difference in alertness after deep knee bends before the lecture. 
C)Fail to reject H0. There is evidence to suggest that there is no difference in alertness after deep knee bends before the lecture. 
D)Reject H0. There is evidence to suggest that there is no difference in alertness after deep knee bends before the lecture.

Quizplus · Accepted Answer

The null hypothesis (H0) states that there is no difference in alertness after deep knee bends before the lecture. The alternative hypothesis (Ha) states that there is a difference in alertness after deep knee bends before the lecture. The significance level is 5%. The p-value is 0.06. Since the p-value is greater than the significance level, we fail to reject the null hypothesis. This means that there is not enough evidence to suggest that there is a difference in alertness after deep knee bends before the lecture.

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