Given Samples A and B below,

Sample A: 3.5 3.8 3.0 4.5 3.2 4.5 4.6 3.2 4.5

Sample B: 4.7 3.1 2.8 3.5 2.9 3.8 2.8 2.7 4.2

1. Calculate the mean and standard deviation for each sample.

Sample A:

XA =

SA =

Sample B:

XB =

SB =

Round to two decimal places if necessary

2. Calculate the coefficient of variation for each sample.

Sample A:CV A =____%

Sample B:CV B =____%

Round to two decimal places if necessary

3. Which sample is more variable?

a) Sample A

b) Sample B

c) Neither sample is more variable than the other