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6 The numerical value of the variance fl a. is always larger than the numerical value of the standard deviation b. is always smaller than

6 The numerical value of the variance fl a. is always larger than the numerical value of the standard deviation b. is always smaller than the numerical value of the standard deviation c. is negative if the mean is negative d. can be larger or smaller than the numerical value of the standard deviation 7. The standard deviation of a sample was reported to be 20. The report indicated that E( x - X) 2 = I 7200. What has been the sample size? a. 16 b. 17 C. 18 d. 19

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