Stratified random sampling and quota sampling are both classified in the category of probability sampling techniques

Macy is considering topics she finds personally interesting and is beginning to read some of the psychological research on some of these topics. With respect to the scientific method, Macy is working on the _____ step of the method, namely, developing a _____.

A. second; hypothesis B. second; question C. first; hypothesis D. first; question

Heroin is more potent than morphine because

A. it is often injected instead of swallowed. B. it more readily crosses the blood-brain barrier. C. it is a natural opioid. D. it is a synthetic opioid.