A Sample of 21 Elements Is Selected to Estimate a 90

question 66

Multiple Choice

A sample of 21 elements is selected to estimate a 90% confidence interval for the variance of the population. The χ² value(s) to be used for this interval estimation is(are) _____.

• A) -1.96 and 1.96
• B) 12.443
• C) 10.851 and 31.410
• D) 12.443 and 28.412

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