13. | Basic Computation: Variance, Standard Deviation Given the sample data 23 17 15 30 25 (a) Find the range. (b) Verify that Ex = 110 and Ex² = 2568. (c) Use the results of part (b) and appropriate...

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Extracted text: 13. | Basic Computation: Variance, Standard Deviation Given the sample data 23 17 15 30 25 (a) Find the range. (b) Verify that Ex = 110 and Ex² = 2568. (c) Use the results of part (b) and appropriate computation formulas to com- pute the sample variance s? and sample standard deviation s. (d) Use the defining formulas to compute the sample variance s² and sample standard deviation s. (e) Suppose the given data comprise the entire population of all values. Compute the population variance o? and population standard deviation o.