Question
(Sample Size for Estimating a Mean) The lifetime of a certain brand of battery is known to have a standard deviation of 23 hours. Suppose
(Sample Size for Estimating a Mean)
The lifetime of a certain brand of battery is known to have a standard deviation of 23 hours. Suppose that a random sample of 70 such batteries has a mean lifetime of 40.6 hours. Based on this sample, find a 99% confidence interval for the true mean lifetime of all batteries of this brand. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
What is the lower limit of the 99 % confidence interval? =
What is the upper limit of the 99% confidence interval? =
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A Survey of Mathematics with Applications
Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde
10th edition
134112105, 134112342, 9780134112343, 9780134112268, 134112261, 978-0134112107
