Q3.d. A sample of 150 Samsung phone batteries showed a mean lifetime of 1400 hours and a standard deviation of 120 hours. A sample of 200 i-phone batteries showed a mean lifetime of 1200 hours and a standard deviation of 80 hours. Find a 95% confidence interval for the difference of the mean lifetimes of the Samsung batteries and i-phone batteries.

Q3.d. A sample of 150 Samsung phone batteries showed a mean lifetime of 1400 hours and a standard deviation of 120 hours. A sample of 200 i-phone batteries showed a mean lifetime of 1200 hours and a standard deviation of 80 hours. Find a 95% confidence interval for the difference of the mean lifetimes of the Samsung batteries and i-phone batteries.

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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Question

Q3.d.

A sample of 150 Samsung phone batteries showed a mean lifetime of 1400 hours and a
standard deviation of 120 hours. A sample of 200 i-phone batteries showed a mean
lifetime of 1200 hours and a standard deviation of 80 hours. Find a 95% confidence
interval for the difference of the mean lifetimes of the Samsung batteries and i-phone
batteries.

Expert Solution