Men’s Pulse Rates (Example 10) A random sample of 25 men’s resting pulse rates shows a mean of 72 beats per minute and a standard deviation of 13. a. Find a 95 % confidence interval for the population mean pulse rate for men, and report it in a sentence. You may use the table given for Exercise 9.25 . b. Find a 99 % confidence interval. c. Which interval is wider, and why?
Men’s Pulse Rates (Example 10) A random sample of 25 men’s resting pulse rates shows a mean of 72 beats per minute and a standard deviation of 13. a. Find a 95 % confidence interval for the population mean pulse rate for men, and report it in a sentence. You may use the table given for Exercise 9.25 . b. Find a 99 % confidence interval. c. Which interval is wider, and why?
Solution Summary: The author determines the 95% confidence interval for the population mean of men resting pulse rate, using the table from 9.25.
Men’s Pulse Rates (Example 10) A random sample of 25 men’s resting pulse rates shows a mean of 72 beats per minute and a standard deviation of 13.
a. Find a
95
%
confidence interval for the population mean pulse rate for men, and report it in a sentence. You may use the table given for Exercise
9.25
.
b. Find a
99
%
confidence interval.
c. Which interval is wider, and why?
Definition Definition Number of subjects or observations included in a study. A large sample size typically provides more reliable results and better representation of the population. As sample size and width of confidence interval are inversely related, if the sample size is increased, the width of the confidence interval decreases.
Question 2
The data below provides the battery life of thirty eight (38) motorcycle batteries.
100 83 83 105 110 81 114
99 101 105 78 115 74 96
106
89
94 81 106 91 93 86
79 103 94 108 113 100
117 120
77 93
93 85 76
89 78 88
680
a. Test the hypothesis that mean battery life is greater than 90. Use the 1% level of
significance.
b. Determine if the mean battery life is different from 80. Use the 10% level of
significance. Show all steps for the hypothesis test
c. Would your conlcusion in part (b) change at the 5% level of significance? |
d. Confirm test results in part (b) using JASP. Note: All JASP input files and output
tables should be provided
Suppose that 80% of athletes at a certain college graduate. You randomly select eight athletes. What’s the chance that at most 7 of them graduate?
Suppose that you flip a fair coin four times. What’s the chance of getting at least one head?
Chapter 9 Solutions
The King's minion: Richelieu, Louis XIII, and the affair of Cinq-Mars
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