A company wishes to determine the proportion of time workers are idle. Using work sampling, the idle time during 150 observations is 26%. If the company wants a 95% confidence interval, how many more observations are needed if the company wants to be within +/-4% of the true proportion?

A company wishes to determine the proportion of time workers are idle.

1.	A company wishes to determine the proportion of time workers are idle. Using work sampling, the idle time during 150 observations is 26%. If the company wants a 95% confidence interval, how many more observations are needed if the company wants to be within +/-4% of the true proportion?
A.	9 observations
B.	150 observations
C.	312 observations
D.	462 observations
Answer» D. 462 observations

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A company wishes to determine the proportion of time workers are idle. Using work sampling, the idle time during 150 observations is 26%. If the company wants a 95% confidence interval, how many more observations are needed if the company wants to be within +/-4% of the true proportion?

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