Question

Consider the following sample data.

Sample A:	11, 22, 33
Sample B:	81, 92, 103
Sample C:	1,100; 1,111; 1,122

(a) Find the mean and standard deviation for each sample.

	Sample A:	Sample B:	Sample C:
Mean
Sample Standard Deviation

(b) What does this exercise show about the standard deviation?

• The idea is to illustrate that the standard deviation is not a function of the value of the mean.

• The idea is to illustrate that the standard deviation is a function of the value of the mean.

Answer 1

using excel function: average(array) ; stdev(array)

from given data

a)

Groups	A	B	C
Average	22	92	1111
standard deviation	11	11	11

b)

The idea is to illustrate that the standard deviation is not a function of the value of the mean.