Managers at an automobile manufacturing plant would like to es mean completion time of an assembly line operation, . The mar to choose a random sample of completion times and estimate u sample. Assuming that the standard deviation of the population completion times is 10.1 minutes, what is the minimum sample si: for the managers to be 95% confident that their estimate is withir of u? Carry your intermediate computations to at least three decimal Write your answer as a whole number (and make sure that it is

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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 u via the
sample. Assuming that the standard deviation of the population of
completion times is 10.1 minutes, what is the minimum sample size needed
for the managers to be 95% confident that their estimate is within 2.0 minutes
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).
(If necessary, consult a list of formulas.)
Transcribed Image Text: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 u via the sample. Assuming that the standard deviation of the population of completion times is 10.1 minutes, what is the minimum sample size needed for the managers to be 95% confident that their estimate is within 2.0 minutes 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). (If necessary, consult a list of formulas.)
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