Homework Answers
Given : Sample size=n=28
Sample standard deviation=s=2.65
Hypothesis : 
VS
The test statistic under Ho is,
A) For 
Critical value = 
; from excel "=CHIINV(0.05,27)"
Decision : Here , 
Therefore , fail to reject Ho at 5% significance level.
Conclusion : Hence , there is not sufficient evidence to conclude that the standard deviation has decreased.
B) For 
Critical value = 
; from excel "=CHIINV(0.01,27)"
Decision : Here , 
Therefore , fail to reject Ho at 1% significance level.
Conclusion : Hence , there is not sufficient evidence to conclude that the standard deviation has decreased.
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inches with a standard deviation of 3.6 inches. Assume the variable
is normally distributed. Find the probability that the mean of a
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