The firing rate of the ________ determines the strength of contraction of a muscle

When all possible samples have been randomly selected from a single

population, the standard deviation of the resulting distribution of means is called a. the "true" standard deviation of the sample's individual scores b. the "true" standard deviation of the population's individual scores c. the standard error of the mean d. sample variance plus error variance

It is important to distinguish between shared and nonshared environments when determining what type of experiences contribute to intelligence because:

A) environmental factors have more influence on intelligence than genes. B) genes have no influence on intelligence compared with the environment. C) two people who live in the same household will have some, but not all, experiences in common. D) genes and environment contribute equally to intelligence.