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Students in a semester-long health-fitness program have

Probability and Statistical Inference | 9th Edition | ISBN: 9780321923271 | Authors: Robert V. Hogg, Elliot Tanis, Dale Zimmerman ISBN: 9780321923271 41

Solution for problem 9E Chapter 7.2

Probability and Statistical Inference | 9th Edition

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Probability and Statistical Inference | 9th Edition | ISBN: 9780321923271 | Authors: Robert V. Hogg, Elliot Tanis, Dale Zimmerman

Probability and Statistical Inference | 9th Edition

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Problem 9E

PROBLEM 9E

Students in a semester-long health-fitness program have their percentage of body fat measured at the beginning of the semester and at the end of the semester. The following measurements give these percentages for 10 men and for 10 women:

(a) Find a 90% confidence interval for the mean of the difference in the percentages for the males.

(b) Find a 90% confidence interval for the mean of the difference in the percentages for the females.

(c) On the basis of these data, have these percentages decreased?

(d) If possible, check whether each set of differences comes from a normal distribution.

Step-by-Step Solution:
Step 1 of 3

Histogram  Divide data o Equal width o No overlapping  Bar chart o Skew­ pulls direction of mean o Symmetric Numeric Summary Center, spread, and location  Greek letters for population  Roman letters for statistics 1. Mean  µ= population mean  x bar= sanple mean o ∑ Xi all over n= sample mean k=0 2. Mean vs. Median a. Mean used the most b. N is small when outliers occur c. Use median, mean is too affected Spread 1. Range (Max­Min) a. Sensitive to outliers 2. IQR a. Not sensitive to outliers Variability­ Xi­X bar

Step 2 of 3

Chapter 7.2, Problem 9E is Solved
Step 3 of 3

Textbook: Probability and Statistical Inference
Edition: 9
Author: Robert V. Hogg, Elliot Tanis, Dale Zimmerman
ISBN: 9780321923271

Since the solution to 9E from 7.2 chapter was answered, more than 427 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: Probability and Statistical Inference , edition: 9. This full solution covers the following key subjects: Percentages, these, Semester, mean, ind. This expansive textbook survival guide covers 59 chapters, and 1476 solutions. The answer to “Students in a semester-long health-fitness program have their percentage of body fat measured at the beginning of the semester and at the end of the semester. The following measurements give these percentages for 10 men and for 10 women: (a) Find a 90% confidence interval for the mean of the difference in the percentages for the males.(b) Find a 90% confidence interval for the mean of the difference in the percentages for the females.(c) On the basis of these data, have these percentages decreased?(d) If possible, check whether each set of differences comes from a normal distribution.” is broken down into a number of easy to follow steps, and 97 words. Probability and Statistical Inference was written by and is associated to the ISBN: 9780321923271. The full step-by-step solution to problem: 9E from chapter: 7.2 was answered by , our top Statistics solution expert on 07/05/17, 04:50AM.

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Students in a semester-long health-fitness program have