Stimulus motives are largely learned

Suppose you collect data about child abuse and find that mothers who have their first child before age 18 are more likely to be abusive than mothers who are older

However, you also note that young mothers are also more likely to be poor and have less access to prenatal care. Therefore, you cannot draw conclusions about maternal age and child abuse. The reason you cannot draw this conclusion is because your study involved: a. a sequential-cohort design b. a nonrandom sample c. a nonrepresentative sample d. confounding

Imagine that all members of a class have been tested to determine the level of 5-HIAA in their cerebrospinal fluid. Using this information, you could predict that __________.

A. male classmates with low 5-HIAA levels will be more aggressive than those with high levels B. low 5-HIAA levels will be associated with good exam performance C. high 5-HIAA levels will be associated with poor sleep patterns in males D. male classmates with high 5-HIAA levels may not be alive 10 years from now