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

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).

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!


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)

Wish You the Best in your Studies.

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