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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 60 clamps, the mean time to complete this step was 45.5 seconds. Assume that the population standard deviation is o = 7 seconds. Round the critical value to no less than three decimal places. Part: 0 / 2 Part 1 of 2 (a) Construct an 80% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. An 80% confidence interval for the mean is <μ< Part: 1 / 2 Part 2 of 2 X (b) Find the sample size needed so that a 99.5% confidence interval will have margin of error of 1.5. A sample size of is needed in order to obtain a 99.5% confidence interval with a margin error of 1.5. Round the sample size up to the nearest integer. X

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 60 clamps, the mean time to complete this step was 45.5 seconds. Assume that the population standard deviation is o = 7 seconds. Round the critical value to no less than three decimal places. Part: 0 / 2 Part 1 of 2 (a) Construct an 80% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. An 80% confidence interval for the mean is <μ< Part: 1 / 2 Part 2 of 2 X (b) Find the sample size needed so that a 99.5% confidence interval will have margin of error of 1.5. A sample size of is needed in order to obtain a 99.5% confidence interval with a margin error of 1.5. Round the sample size up to the nearest integer. X

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.6: Exponential And Logarithmic Equations
Problem 70E
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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 60 clamps, the mean time to complete this step was 45.5 seconds. Assume that the population standard deviation is 7 seconds. Round the critical value to no less than three decimal places. Part: 0 / 2 Part 1 of 2 (a) Construct an 80% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. An 80% confidence interval for the mean is <µ< Part: 1 / 2 Part 2 of 2 X Ś (b) Find the sample size needed so that a 99.5% confidence interval will have margin of error of 1.5. A sample size of is needed in order to obtain a 99.5% confidence interval with a margin error of 1.5. Round the sample size up to the nearest integer. X 3 =
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 60 clamps, the mean time to complete this step was 45.5 seconds. Assume that the population standard deviation is 7 seconds. Round the critical value to no less than three decimal places. Part: 0 / 2 Part 1 of 2 (a) Construct an 80% confidence interval for the mean time needed to complete this step. Round the answer to at least one decimal place. An 80% confidence interval for the mean is <µ< Part: 1 / 2 Part 2 of 2 X Ś (b) Find the sample size needed so that a 99.5% confidence interval will have margin of error of 1.5. A sample size of is needed in order to obtain a 99.5% confidence interval with a margin error of 1.5. Round the sample size up to the nearest integer. X 3 =
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