Sudzy introduced a new formula for their hair conditioner. They want to conduct an experiment to compare the hair strength of people using the new formula with those using the current formula. Information on the twelve volunteers is shown in the table.

Volunteer Age, year Male 21 Female 3? Female 30 Male 32 Male 24 Female 22 Male 45 Female 42 Male 42 '4 Female 4? Male 36 Female 23