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A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, m were taken. Analysis of 15 bulbs of model A showed a mean lifetime of 1352 hours and a showed a mean lifetime of 1365 hours and a standard deviation of 99 hours. Assume that and that the variances of these populations are equal. Construct a 95% confidence interva bulbs and the mean lifetime μ₂ of model B bulbs. Then find the lower limit and upper limit Carry your intermediate computations to at least three decimal places. Round your respon formulas.) Lower limit: Upper limit: X 5

A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, m were taken. Analysis of 15 bulbs of model A showed a mean lifetime of 1352 hours and a showed a mean lifetime of 1365 hours and a standard deviation of 99 hours. Assume that and that the variances of these populations are equal. Construct a 95% confidence interva bulbs and the mean lifetime μ₂ of model B bulbs. Then find the lower limit and upper limit Carry your intermediate computations to at least three decimal places. Round your respon formulas.) Lower limit: Upper limit: X 5

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 15 bulbs of model A showed a mean lifetime of 1352 hours and a standard deviation of 88 hours. Analysis of 14 bulbs of model B showed a mean lifetime of 1365 hours and a standard deviation of 99 hours. Assume that the populations of lifetimes for each model are normally distributed and that the variances of these populations are equal. Construct a 95% confidence interval for the difference H₁ H₂ between the mean lifetime μ, of model A bulbs and the mean lifetime ₂ of model B bulbs. Then find the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your responses to at least two decimal places. (If necessary, consult a list of formulas.) Lower limit: Upper limit: X 5
Transcribed Image Text:A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 15 bulbs of model A showed a mean lifetime of 1352 hours and a standard deviation of 88 hours. Analysis of 14 bulbs of model B showed a mean lifetime of 1365 hours and a standard deviation of 99 hours. Assume that the populations of lifetimes for each model are normally distributed and that the variances of these populations are equal. Construct a 95% confidence interval for the difference H₁ H₂ between the mean lifetime μ, of model A bulbs and the mean lifetime ₂ of model B bulbs. Then find the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your responses to at least two decimal places. (If necessary, consult a list of formulas.) Lower limit: Upper limit: X 5
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