Population variance is an average of the squared deviations from the population mean value. True False
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The sum of deviations about the arithmetic mean is always equal to zero. A. True B. False 2. The average of the squared deviations about the arithmetic mean is called the variance. A. True B. False 3. The sample standard deviation is calculated by taking the square root of the population standard deviation. A. True B. False 4. The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals a. 9. b. 4096. c. 8. d. 6561.
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In calculating the sample variance, the sum of the squared deviations around the mean is divided by n - 1 to avoid underestimating the unknown population variance. True or False
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