The manufacturer of cell phone batteries wants to estimate the useful life of th
ID: 3247492 • Letter: T
Question
The manufacturer of cell phone batteries wants to estimate the useful life of the battery (in thousands of hours). The estimate is to be within .06 (60) hours. Assume a 95 percent level of confidence and that the standard deviation of the useful life of the battery is .80 (800) hours.
Determine the required sample size. (Round your answer to the next whole number.)
The manufacturer of cell phone batteries wants to estimate the useful life of the battery (in thousands of hours). The estimate is to be within .06 (60) hours. Assume a 95 percent level of confidence and that the standard deviation of the useful life of the battery is .80 (800) hours.
Explanation / Answer
Standard deviation is 0.8
For 95% confidence, the z value is 1.96
Also, the estimate is 0.06
thus, 0.06=1.96*0.8/sqrt(n)
thus sqrt(n)=26.13
thus n is 683
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