In a time use study, 47 randomly selected managers were found to spend a mean of 3 16 h each day on paperwork The population standard deviation is known to be about 1 16 h Construct the 99 confidence interval for the mean time spent on paperwork by all managers Round thez z value to 3 decimal places and the confidence interval values to 2 decimal places For part (a), use a positivez z value (a) What is the criticalz z value that will need to be used to calculate the confidence interval (b) What is the 99 confidence interval

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Question: In a time-use study, 47 randomly selected managers were found to spend a mean of 3.16 h each day on paperwork. The population standard deviation

In a time-use study, 47 randomly selected managers were found to spend a mean of 3.16 h each day on paperwork. The population standard deviation is known to be about 1.16 h. Construct the 99 % confidence interval for the mean time spent on paperwork by all managers.

Round thez

-value to 3 decimal places and the confidence interval values to 2 decimal places.

For part (a), use a positivez

-value.

(a) What is the criticalz

-value that will need to be used to calculate the confidence interval?

(b) What is the 99% confidence interval?

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