The age ranges within a period—and even the periods themselves—are steadfast and unchanging

The environmentalists' position on intelligence is BEST summarized by saying that ______

a. heredity is not involved in intelligence except in cases of congenital brain malformations or retardation b. mental capacities are determined primarily by the environment, and their development depends exclusively on environmental experiences c. mental capacities are inherited, but their development depends on environmental experiences d. intelligence results from a combination of genetic inheritance and prenatal experiences

The larger the F ratio:

a. the less likely we are to reject the null hypothesis. b. the less likely our results are due to chance. c. the greater the probability of a Type I error. d. the less likely there is a confound.