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The statistics ∑xi = 4593 and ∑xi^2= 1005,187, were obtained from a sample of 21 autoworkers. The lower and upper limit for the 99% confidence interval for the population variance is. (D)
A. 7.32 and 41.81
B. 11.31 and 62.73
C. 12.44 and 71.61
D. 15.81 and 85.10
E. None of the above
The answer is D but I need help with the steps. Please show the steps.
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