Question

Given the sample data.

x:

23

17

15

30

27

(a) Find the range.


(b) Verify that Σx = 112 and Σx² = 2,672.

Σx	=
Σx2	=

(c) Use the results of part (b) and appropriate computation formulas to compute the sample variance s² and sample standard deviation s. (Round your answers to two decimal places.)

s2	=
s	=

(d) Use the defining formulas to compute the sample variance s² and sample standard deviation s. (Round your answers to two decimal places.)

s2	=
s	=

(e) Suppose the given data comprise the entire population of all x values. Compute the population variance σ² and population standard deviation σ. (Round your answers to two decimal places.)

σ2	=
σ	=

Answer 1