Professor Crass tells her students that each human eye contains around _____ million rods.

Physical activity contributes in a fundamental way to

a. a toddler's self­concept. b. a parent's mental health. c. gender role development. d. a father's involvement with a toddler.

Which of the following is not an assumption of the ?2 test of independence? a. It is a nonparametric test

b. It is appropriate only for ordinal data. c. The frequency in each cell should be at least 5. d. The sample should be randomly selected.