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Assume that the population has a normal distribution. 5) The mean replacement time for a random sample of 20 washing machines is 9.0 years and the standard deviation is 24 years Construct a 99% confidence interval for the standard deviation, o, of the replacement times of all washing machines of this type. A) 1.7 yr

Assume that the population has a normal distribution. 5) The mean replacement time for a random sample of 20 washing machines is 9.0 years and the standard deviation is 24 years Construct a 99% confidence interval for the standard deviation, o, of the replacement times of all washing machines of this type. A) 1.7 yr

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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ution. 1) n = 10, x = 13.8, s= 2.4, 95 percent 1) A) (12.11, 15.49) B) (12.08, 15.52) C) (12.09, 15.51) D) (12.41, 15.19) Find the necessary sample size. eI A population is normal with a variance of 99 Supnose vou wish to estimate the population mean p. Find the sample size needed to assure with 68 26 percent confidence that the sample mean wili hot differ from the population mean by morethan 4 units. A) 9 2) - B) 7 C) 613 D) 25 ee the given degree of confidence and sample data to construct a confidence interval for the population proportion p. S) A survey of 865 votersin one state reveals that 408 favor approval of an issue beforethe legislature. Construct the 95% confidence interval for thetrueproportion of all votersin the state who favor approval. A) 0.438 <p< 0.505 C) 0.471 <p< 0.472 3) B) 0.444 <p< 0.500 D) 0.435 <p<0.508 Solve the problem. 4) A pollster wishes to estimate the true proportion of U.S voters that oppose capital punishment. How many voters should be surveyed in order to be 96 percent confident that the true proportion is estimated to within 0.02? A) 2627 4) B) 53 C) 2626 D) 1 Use the given degree of confidence and sampledata to find a confidence interval for the population standard deviation a. Assume that the population has a normal distribution. 5) The mean replacement time for a random sample of 20 w ashing machines is 9.0 years and the standard deviation is 2.4 years. Construct a 99% confidence interval for the standard deviation, o, of the replacement times of all washing machines of this type. A) 1.7 yr <o<5.0 r C) 1.7 yr <o<3.8 yr 5) B) 1.6 yr <o< 4.6 yr D) 1.7 yr <o< 4.0 yr Compute the test statistic used to test the null hypothesis that p1 = P2- n2 = 148 x2 = 67 6) n1 = 156 6) X1 = 75 A) 11.102 B) 0.490 C) 0.480 D) 5.978 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Use the traditional method to test the given hypothesis. A ssume that the samples are independent and that they have been randomly selected (SHOW ALL WORK in the space provided) 1
Transcribed Image Text:ution. 1) n = 10, x = 13.8, s= 2.4, 95 percent 1) A) (12.11, 15.49) B) (12.08, 15.52) C) (12.09, 15.51) D) (12.41, 15.19) Find the necessary sample size. eI A population is normal with a variance of 99 Supnose vou wish to estimate the population mean p. Find the sample size needed to assure with 68 26 percent confidence that the sample mean wili hot differ from the population mean by morethan 4 units. A) 9 2) - B) 7 C) 613 D) 25 ee the given degree of confidence and sample data to construct a confidence interval for the population proportion p. S) A survey of 865 votersin one state reveals that 408 favor approval of an issue beforethe legislature. Construct the 95% confidence interval for thetrueproportion of all votersin the state who favor approval. A) 0.438 <p< 0.505 C) 0.471 <p< 0.472 3) B) 0.444 <p< 0.500 D) 0.435 <p<0.508 Solve the problem. 4) A pollster wishes to estimate the true proportion of U.S voters that oppose capital punishment. How many voters should be surveyed in order to be 96 percent confident that the true proportion is estimated to within 0.02? A) 2627 4) B) 53 C) 2626 D) 1 Use the given degree of confidence and sampledata to find a confidence interval for the population standard deviation a. Assume that the population has a normal distribution. 5) The mean replacement time for a random sample of 20 w ashing machines is 9.0 years and the standard deviation is 2.4 years. Construct a 99% confidence interval for the standard deviation, o, of the replacement times of all washing machines of this type. A) 1.7 yr <o<5.0 r C) 1.7 yr <o<3.8 yr 5) B) 1.6 yr <o< 4.6 yr D) 1.7 yr <o< 4.0 yr Compute the test statistic used to test the null hypothesis that p1 = P2- n2 = 148 x2 = 67 6) n1 = 156 6) X1 = 75 A) 11.102 B) 0.490 C) 0.480 D) 5.978 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Use the traditional method to test the given hypothesis. A ssume that the samples are independent and that they have been randomly selected (SHOW ALL WORK in the space provided) 1
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