(a) Determine the standard deviation of recumbent length for all 20 observations.

(b) Determine the standard deviation of recumbent length for the males.

(c) Determine the standard deviation of recumbent length for females.

What effect does blocking by gender have on the standard deviation of recumbent length for each gender? choose answer choice below.

a.) The standard deviation for each group is the same is it is for the groups combined.

b.) The standard deviation is lower for each group than it is for the groups combined.

c.) The standard deviation is higher for each group than it is for the groups combined.

Males 104.0 94.4 94.3 97.6 98.3 100.6 86.2 103.0 90.7 100.9 Females 102.9 100.8 100.9 96.3 102.8 105.0 98.1 106.5 95.4 114.5