The sample variance, SS/(n-1), is an absolutely unbiased estimator of the population variance.

The first stage of in the sexual response cycle is

a. excitement b. transition c. resolution d. plateau

Which of the following best summarizes our understanding of the effects of maternal cocaine use on fetuses and infants?

A) The defects in the infant are usually cognitive; e.g., mental retardation. B) The effects are very similar to fetal alcohol spectrum disorder; e.g., physical defects and mental retardation. C) The effects are similar to those of heroin, such as high-pitched crying, tremors, and convulsions. D) The effects are not clearly understood because it is difficult to separate the effects of cocaine from those of poverty and other drugs.