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7. The mcasurcments of the drying time, in hours, of a certain brand of latex paint follow a normal distribution. Suppose 22 mcasurements of thc drying times are recorded. The sample mcan and the standard deviation of 22 mcasurements is 3.70 and 0.916, respcc- tively. (a) Construct a 90% confidence interval for the truc mcan measuremcnts of the drying times. Assume that the distribution of the mcasurements of the drying times is approximately normal. (b) Find the 95% confidence interval for the standard deviation of mcasurements of the drying timces.

7. The mcasurcments of the drying time, in hours, of a certain brand of latex paint follow a normal distribution. Suppose 22 mcasurements of thc drying times are recorded. The sample mcan and the standard deviation of 22 mcasurements is 3.70 and 0.916, respcc- tively. (a) Construct a 90% confidence interval for the truc mcan measuremcnts of the drying times. Assume that the distribution of the mcasurements of the drying times is approximately normal. (b) Find the 95% confidence interval for the standard deviation of mcasurements of the drying timces.

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
Problem 1P
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7. The mcasurcments of the drying time, in hours, of a certain brand of latex paint follow a normal distribution. Suppose 22 mcasurcments of thc drying times are recorded. The sample mcan and the standard deviation of 22 mcasurements is 3.70 and 0.916, respcc- tively. (a) Construct a 90% confidence interval for the true mcan measuremcnts of the drying timcs. Assume that the distribution of the mcasurements of the drying times is approximately normal. (b) Find the 95% confidence interval for the standard deviation of mcasurements of the drying timcs.
Transcribed Image Text:7. The mcasurcments of the drying time, in hours, of a certain brand of latex paint follow a normal distribution. Suppose 22 mcasurcments of thc drying times are recorded. The sample mcan and the standard deviation of 22 mcasurements is 3.70 and 0.916, respcc- tively. (a) Construct a 90% confidence interval for the true mcan measuremcnts of the drying timcs. Assume that the distribution of the mcasurements of the drying times is approximately normal. (b) Find the 95% confidence interval for the standard deviation of mcasurements of the drying timcs.
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