Concept explainers
(a)
To explain: the reason that the subjects were not permitted by the researchers to choose whether to be in the sleep deprivation group or the sleep group without restrictions.
(a)
Explanation of Solution
The subjects are assigned arbitrary to the two groups to ensure that the two groups are as close as possible and to remove any variables that have not been measured.
(b)
To explain: the inference would be drawn, the response with sufficient proof would be justified.
(b)
Answer to Problem 58E
For volunteers who have been allowed to sleep, the average is greater than the average for volunteers who were deprived of sleep.
Explanation of Solution
Given:
It is noticed on the dot plot that almost no dots lay above 15.92 and to the right of it. This suggests that a sample mean difference or 15.92 is very difficult to be obtained and therefore we infer that the mean tends to be significantly greater for those who were able to sleep than for those who were deprived of sleep.
(c)
To Explain: the error that make type I error or type II error on the basis of given information.
(c)
Answer to Problem 58E
Type I error
Explanation of Solution
The hypotheses:
It is concluded in part(b) that the means were considerably different and therefore the null hypothesis was dismissed.
Type I error: Reject
Type II error: Fail to reject
Although, it is rejected the null hypothesis
Chapter 10 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
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