Fundamentals of Statistics (5th Edition)
5th Edition
ISBN: 9780134508306
Author: Michael Sullivan III
Publisher: PEARSON
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Textbook Question
Chapter B.3, Problem 1AYU
- (a) Determine the critical value for a right-tailed test of a population standard deviation with 18 degrees of freedom at the α = 0.05 level of significance.
- (b) Determine the critical value for a left-tailed test of a population standard deviation for a
sample of size n = 23 at the α = 0.1 level of significance. - (c) Determine the critical values for a two-tailed test of a population standard deviation for a sample of size n = 30 at the α = 0.05 level of significance.
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60 and finds that the mean number of miles driven is 22.9. The population standard deviation is 3.1 miles. At α=0.05, is there sufficient evidence that those drivers over
60 years old drive less than 24 miles per day on average? Assume that the variable is normally distributed. Use the P-value method with a graphing calculator.
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. A researcher wishes to see if people over age 60 drive less than 24
miles per day. She selects a random sample of 32 drivers over the age of
60 and finds that the mean number of miles driven is 22.9. The population standard deviation is 3.1miles. At α=0.05, is there sufficient evidence that those drivers over 60 years old drive less than 24 miles per day on average? Assume that the variable is normally distributed. Use the
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Chapter B.3 Solutions
Fundamentals of Statistics (5th Edition)
Ch. B.3 - (a) Determine the critical value for a...Ch. B.3 - (a) Determine the critical value for a...Ch. B.3 - To test H0: = 50 versus H1: 50, a random sample...Ch. B.3 - Prob. 4AYUCh. B.3 - Prob. 5AYUCh. B.3 - To test H0: = 0.35 versus H1: 0.35, a random...Ch. B.3 - To test H0: = 4.3 versus H1: 4.3, a random...Ch. B.3 - Prob. 8AYUCh. B.3 - NW 9. Mutual Fund Risk One measure of the risk of...Ch. B.3 - Prob. 10AYU
Ch. B.3 - Pump Design The piston diameter of a certain hand...Ch. B.3 - Prob. 12AYUCh. B.3 - Prob. 13AYUCh. B.3 - Prob. 14AYUCh. B.3 - An Inconsistent Player Sports announcers often...Ch. B.3 - Prob. 16AYUCh. B.3 - Heights of Baseball Players Data obtained from the...Ch. B.3 - NCAA Softball NCAA rules require the circumference...
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- The concentration of hexane (a common solvent) was measured in units of micrograms per liter for a simple random sample of nineteen specimens of untreated ground water taken near a municipal landfill. The sample mean was 289.2 with a sample standard deviation of 6.3. Twenty-two specimens of treated ground water had an average hexane concentration of 285.3 with a standard deviation of 7.6.It is reasonable to assume that both samples come from populations that are approximately normal. Can you conclude that the mean hexane concentration is less in treated water than in untreated water? Use the α = 0.10 level of significance. Use 6-step p-value method.arrow_forwardThe mean noise level of 20 randomly selected areas designated as “casualty doors” was 63.1 dBA, and the sample standard deviation is 4.1 dBA. The mean noise level for 24 randomly selected areas designated as operating theaters was 56.3 dBA, and the sample standard deviation was 7.5 dBA. At α = 0.05, can it be concluded that there is a difference in the means? What is the type of test to be used?arrow_forwardDetermine the critical values for these tests of a population standard deviation. (a) A right-tailed test with 16 degrees of freedom at the α=0.1 level of significance (b) A left-tailed test for a sample of size n=28 at the α=0.05 level of significance (c) A two-tailed test for a sample of size n=29 at the α=0.05 level of significance Round to three decimal places.arrow_forward
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