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Efficient manufacturing: Efficiency experts study the possible. One of the steps used to manufacture a metal clamp involves the drilling of three holes. In a sample of 70 clamps, th esses mean time to complete this step was 54.2 seconds. Assume that the population standard deviation iso = 9 seconds. Round critical value to no less than three decimal places. Part 1 of 2 (a) Construct a 98% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. A 98% confidence interval for the mean is 51.7 < u < 56.7 Part: 1 / 2

Efficient manufacturing: Efficiency experts study the possible. One of the steps used to manufacture a metal clamp involves the drilling of three holes. In a sample of 70 clamps, th esses mean time to complete this step was 54.2 seconds. Assume that the population standard deviation iso = 9 seconds. Round critical value to no less than three decimal places. Part 1 of 2 (a) Construct a 98% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. A 98% confidence interval for the mean is 51.7 < u < 56.7 Part: 1 / 2

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
Section10.5: Comparing Sets Of Data
Problem 13PPS
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Efficient manufacturing: Efficiency experts study the processes used to manufacture items in order to make them as efficient as possible. One of the steps used to manufacture a metal clamp involves the drilling of three holes. In a sample of 70 clamps, the mean time to complete this step was 54.2 seconds. Assume that the population standard deviation is o = 9 seconds. Round the critical value to no less than three decimal places. Part 1 of 2 (a) Construct a 98% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. A 98% confidence interval for the mean is 51.7 <µ < 56.7 ola Part: 1 / 2 Part 2 of 2 (b) Find the sample size needed so that a 99% confidence interval will have margin of error of 1.5. A sample size of is needed in order to obtain a 99% confidence interval with a margin error of 1.5. Round the sample size up to the nearest integer.
Transcribed Image Text:Efficient manufacturing: Efficiency experts study the processes used to manufacture items in order to make them as efficient as possible. One of the steps used to manufacture a metal clamp involves the drilling of three holes. In a sample of 70 clamps, the mean time to complete this step was 54.2 seconds. Assume that the population standard deviation is o = 9 seconds. Round the critical value to no less than three decimal places. Part 1 of 2 (a) Construct a 98% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. A 98% confidence interval for the mean is 51.7 <µ < 56.7 ola Part: 1 / 2 Part 2 of 2 (b) Find the sample size needed so that a 99% confidence interval will have margin of error of 1.5. A sample size of is needed in order to obtain a 99% confidence interval with a margin error of 1.5. Round the sample size up to the nearest integer.
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