An electrical equipment company manufactures light bulbs that have an approximately normally distributed life, with a standard deviation of 40 hours. with a standard deviation of 40 hours. If a sample of 30 bulbs has an average life of 780 hours, calculate:(a) Perform the point estimate for the population mean of the light bulbs.b) A 96% confidence interval for the population mean of all the light bulbs produced by this company.

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 14PPS
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An electrical equipment company manufactures light bulbs that have an approximately normally distributed life, with a standard deviation of 40 hours. with a standard deviation of 40 hours. If a sample of 30 bulbs 
has an average life of 780 hours, calculate:
(a) Perform the point estimate for the population mean of the light bulbs.
b) A 96% confidence interval for the population mean of all the light bulbs produced by this company. 

 
 

 

 

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