We know have all means and ingredients to calculate the sample variances and means for each age category.

calculations Students' ages Students' fathers ages

Sample variance ( ) 2 1 = 421.37 30 14 ( ) 2 1 = 2379 30 79.3

Sample S.D. (14) 3.7 years (20.3) 9 years

Students' younger s. ages

( ) 2 1 = 1696 30 56

(8) 7.5 years

a) Doe the values acquired in the above table make sense? Justify.

b) How can you justify the values of each category, i.e., student vs parent, vs sibling's ages.