The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours. (d) Compare the results of (a) and (
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours. (d) Compare the results of (a) and (
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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1. The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours.
(d) Compare the results of (a) and (c). What conclusions do you reach?
2. The file contains the amount that a sample of nine customers spent for lunch ($) at a fast-food restaurant:
4.20
5.03
5.86
6.45
7.38
7.54
8.46
8.47
9.87
(d) Because the sample size is 9, do you need to be concerned about the shape of the population distribution when conducting the t test in (a)? Explain.
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