Mathematics, 15.04.2020 18:28 keving4three
A testing engineer in a light bulb factory is planning a study to estimate the average life of a large shipment of light bulbs. The engineer wants to estimate the average life within plus or minus 16 hours with 95 percent confidence. Assuming a process standard deviation of 90 hours, determine the sample size for this study.
a. 7
b. 43
c. 58
d. 122
Answers: 2
, where 
= prior population standard deviation, z= Critical z-value for confidence level and E = Margin of error.
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