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1. A testing laboratory is trying to make its results more consistent by standardizing certain procedures. From a sample of size 28 the sample standard deviation by the revised procedure is found to be 1.74 units. Plotting concentrations on normal probability paper did not show any marked departure from a normal distribution. Is there evidence at the 5% level of significance that the sample standard deviation is significantly less than the former population standard deviation of 2.92 units?

1. A testing laboratory is trying to make its results more consistent by standardizing certain procedures. From a sample of size 28 the sample standard deviation by the revised procedure is found to be 1.74 units. Plotting concentrations on normal probability paper did not show any marked departure from a normal distribution. Is there evidence at the 5% level of significance that the sample standard deviation is significantly less than the former population standard deviation of 2.92 units?

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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Problems 1. A testing laboratory is trying to make its results more consistent by standardizing certain procedures. From a sample of size 28 the sample standard deviation by the revised procedure is found to be 1.74 units. Plotting concentrations on normal probability paper did not show any marked departure from a normal distribution. Is there evidence at the 5% level of significance that the sample standard deviation is significantly less than the former population standard deviation of 2.92 units?
Transcribed Image Text:Problems 1. A testing laboratory is trying to make its results more consistent by standardizing certain procedures. From a sample of size 28 the sample standard deviation by the revised procedure is found to be 1.74 units. Plotting concentrations on normal probability paper did not show any marked departure from a normal distribution. Is there evidence at the 5% level of significance that the sample standard deviation is significantly less than the former population standard deviation of 2.92 units?
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