Construct and explain a 90% confidence interval estimate of the true population mean life of the new light bulb. What size sample would be needed to acheive a margin of error 10 hours or less?
Construct and explain a 90% confidence interval estimate of the true population mean life of the new light bulb. What size sample would be needed to acheive a margin of error 10 hours or less?
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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The quality control manager at a light bulb factory needs to estimate the mean life of a new type of light bulb. The population standard deviation is assumed to be 40 hours. A random sample of 35 light bulbs shows a samole mean of 425 hours. Construct and explain a 90% confidence interval estimate of the true population mean life of the new light bulb.
What size sample would be needed to acheive a margin of error 10 hours or less?
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