Concept explainers
(a)
To construct: and interpret a 95% confidence interval for the difference in the true mean length.
(a)
Answer to Problem 11PT
(-4.175, -1.025)
Explanation of Solution
Given:
Group | |||
Normothermic | 104 | 12.1 | 4.4 |
Hypothermic | 96 | 14.7 | 6.5 |
C=95%
Formula used:
For lower
For upper
Calculation:
Finding the degree of freedom
Endpoints of the
There are 95% confidence that the mean population difference is between -4.175 and -1.025
(b)
To find: that in part (a) suggest that keeping patients warm during surgery affects the average length of patients’ hospital stays yes or not.
(b)
Answer to Problem 11PT
Yes
Explanation of Solution
Given:
Group | |||
Normothermic | 104 | 12.1 | 4.4 |
Hypothermic | 96 | 14.7 | 6.5 |
From the result of part (a), it is observed that the confidence interval is not having 0 and therefore suggests that having patients warm during surgery affects the average length of the patients’ hospital stay.
Chapter 10 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
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