SOLUTION: 5.)Managers at an automobile manufacturing plant would like to estimate the mean completion time of an assembly line operation,
μ . The managers plan to choose a random sample of
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μ . The managers plan to choose a random sample of
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Question 1177048: 5.)Managers at an automobile manufacturing plant would like to estimate the mean completion time of an assembly line operation,
μ . The managers plan to choose a random sample of completion times and estimate μ via the sample. Assuming that the standard deviation of the population of completion times is 10.2 minutes, what is the minimum sample size needed for the managers to be
90% confident that their estimate is within 2.0minutes of μ?
Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).
Hi
the standard deviation of the population of completion times is 10.2 minutes
to be 90% confident that their estimate is within 2.0minutes of μ:
ME = 0r
n = = 70.384 0r 71 sample size (rounding up to nearest whole number)
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