If I used three t tests to make comparisons between three groups on which I had collected data, the probability of a Type I error would be:

Studies of heritability in humans that assume that if genes influence a certain trait, close relatives should be more similar with that trait than distant relatives are called ______ studies

a. family c. strain b. twin d. selection

Low birth weight usually occurs because ____

a. there was a disruption during prenatal development b. of factors that researchers have not yet been able to determine c. of trauma to the placenta d. of irresponsible parents