Given the sample data

x: 23 17 15 30 25

(a) Find the range.

(b) Verify that (x - 110 and (x2 - 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 defining 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 (2 and population standard deviation s.