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The Grades of a Sample of 5 Students,selected from a Large

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The grades of a sample of 5 students,selected from a large population,are given below.
The grades of a sample of 5 students,selected from a large population,are given below.     a.Determine a point estimate for the variance of the population. b.Determine a 95% confidence interval for the variance of the population. c.At 90% confidence,test to determine if the variance of the population is less than or equal to 50.
a.Determine a point estimate for the variance of the population.
b.Determine a 95% confidence interval for the variance of the population.
c.At 90% confidence,test to determine if the variance of the population is less than or equal to 50.

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a.125
b.44.87 to 1032.17 (roun...

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