The scores of a sample of 5 students, selected from a large population, are given below. Score 70 80 60 90 75
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 the 10% level of significance, test to determine if the variance of the population is less than or equal to 50.
a. 125
b. 44.871 to 1033.058
c. H0: ?2 ? 50
Ha: ?2 > 50
?2 = 10 > 7.779 (p-value is between .025 and .05); reject H0
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