The mean of the squared deviations of sample values from their mean is a. an upw

Question

The mean of the squared deviations of sample values from their mean is a. an upward-biased estimator of the population variance. b. a downward-biased estimator of the population variance. c. an unbiased estimator of the population variance. d. either (a) or (b), depending on sample size. 26. In order to calculate a large-sample interval estimate of the population mean, it is nec the following? a. A sample mean. b. A standard normal deviate. c. The two preceding values as well as the standard error of the estimator. d. None of the above. 27. The process of statistical estimation a. is also called forecasting. b. should never be confused with forecasting. c. seeks to make statements about parameters of future populations. d. is correctly described by (a) and (c) above.

Explanation / Answer

26) WHEN WE NEED TO CREATE THE LARGE SAMPLE INTERVAL THE BASIC NECCESSARY ELEMENT TO CREATE THAT INTERVAL IS THE MEAN AND AFTER THAT THE MARGIN OF ERROR WHICH WILL BE ADDED AND SUBTRACTED FROM THE MEAN TO GET THE INTERVAL. THEREFORE THE ANSWER IS OPTION A = SAMPLE MEAN

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