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Construct a 95% confidence interval for the mean time to prepare a tax return. In the next question, you will enter the upper limit of the interval. For now, enter the lower limit of the interval, rounded to 2 decimal places.

Construct a 95% confidence interval for the mean time to prepare a tax return. In the next question, you will enter the upper limit of the interval. For now, enter the lower limit of the interval, rounded to 2 decimal places.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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An accountant wants to know the mean time to prepare a tax return.  He randomly selects 20 returns and measures how long it takes him to prepare each one.  He calculates the mean and standard deviation of the measured times.  He finds that the mean is 2.67 hours and the standard deviation is 0.95 hours. Construct a 95% confidence interval for the mean time to prepare a tax return.  In the next question, you will enter the upper limit of the interval.  For now, enter the lower limit of the interval, rounded to 2 decimal places. 

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