Studies of the epidemiology of suicide suggest that
a) about 10% to 20% of people report suicidal ideation at one point in their life.
b) suicide rates decrease with age.
c) men are more likely to attempt suicide.
d) rates are lower among regular churchgoers.
a
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Insulin increases the entry of tryptophan into the brain by ____
a. weakening the blood-brain barrier b. converting tryptophan into a compound that more easily enters the brain c. increasing metabolic activity only in those areas of the brain that use tryptophan d. causing certain competing amino acids to enter other cells, outside the brain
One thing that's true about correlational studies is that they ____
a. identify third variables that account for associations among variables b. tell us the direction of causality between two variables c. can indicate the degree to which two variables are related d. are not dependent on the validity of research instruments
A pretest-posttest study is an example of a nonequivalent groups design
a. True b. False Indicate whether the statement is true or false
The presence of testosterone triggers the development of ____; the absence of testosterone triggers the automatic development of ____
a. female sex organ; male sex organ b. female hypothalamus; male hypothalamus c. male sex organs; female sex organs d. homosexuality; heterosexuality