Aids permitted: any calculators, any tables and one sheet of notes (8.5" x 11", one side only).
(a) The following data give energy intake and expenditure in MJ/day for 7 soccer players. Can you conclude that there is a difference between intake and expenditure? Do the analysis two ways, with and without assuming normality; do your conclusions agree? Which test has the greater power? Which test is the more robust?
Player: 1 2 3 4 5 6 7
Expenditure: 14.4 12.1 14.3 14.2 15.2 15.5 17.8
Intake: 14.4 9.2 11.8 11.6 12.7 15.0 16.3
(b) The following data give airborne bacteria count (colonies/ft3) for samples from 8 carpeted hospital rooms and 8 uncarpeted hospital rooms. Does there appear to be a difference in the true average bacteria counts between carpeted and uncarpeted rooms?
Carpeted: 11.8 8.2 7.1 13.0 10.8 10.1 14.6 14.0
Uncarpeted: 12.1 8.3 3.8 7.2 12.0 11.1 10.1 13.7