Nearly _____ percent of American working women are caregivers for aging parents

Comparison groups are used to

a) Reduce threats to internal validity and construct validity b) Confirm rival hypotheses c) Rule out treatment effects d) Reduce threats to construct validity and external validity

A sample of n = 25 scores is selected from a population with a variance of ?2 = 16, and the variance is computed for the sample using n – 1 . The sample variance probably will be smaller than 16

Indicate whether the statement is true or false