A sample of 28 elements is selected to estimate a 95% confidence interval for the variance of the population. The chi-square values to be used for this interval estimation are?
A. 11.808 and 49.645.
B. ?14.573 and 43.195.
C. ?16.151 and 40.113.
D. ?15.308 and 44.461.
Answer: B
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