Basic Computation: Variance, Standard Deviation Given the sample data x: 23 17 15 30 25

(a) Find the range.

(b) Verify that x 5 110 and x2 5 2568.

(c) Use the results of part

(b) and appropriate computation formulas to compute the sample variance s2 and sample standard deviation s.

(d) Use the defi ning formulas to compute the sample variance s2 and sample standard deviation s.

(e) Suppose the given data comprise the entire population of all x values.

Compute the population variance s2 and population standard deviation s.