conduct a study comparing the number of injuries in football players who do a new, daily prescribed workout (Group A) to those who plan their own workout schedule and activities (Group B) as they always have done. He selects a random sample from the team and randomly assigns them to either Group A or Group B. He collects data on the incidence of injuries over a 6-month period. The hypothesis is, "The newly designed workout plan will result in fewer injuries than the self-designed workout plan among student football players. The researcher wants to control for extraneous variables by using a homogeneous sample. He knows this will result in __________ generalizability. Group of answer choices generalizability will not be affected decreased increased