Assume that the populations of lifetimes for each model are normally distributed and that the variances of these populations are equal. Construct a 99% confidence interval for the difference −μ1μ2 between the mean lifetime μ1 of model A bulbs and the mean lifetime μ2 of model B bulbs. Then find the lower limit and upper limit of the 99% confidence interval. Carry your intermediate computations to at least three decimal places. Round your responses to at least two decimal places.
A light bulb manufacturer wants to compare the
bulbs of model A showed a mean lifetime of
hours and a standard deviation of
hours. Analysis of
bulbs of model B showed a mean lifetime of
hours and a standard deviation of
hours. Assume that the populations of lifetimes for each model are
confidence interval for the difference
between the mean lifetime
of model A bulbs and the mean lifetime
of model B bulbs. Then find the lower limit and upper limit of the
confidence interval.
Carry your intermediate computations to at least three decimal places. Round your responses to at least two decimal places.
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