Women in their late thirties are ______ times as likely to have dizygotic twins as are women in their early twenties

Our ________ is based on our perception that we belong to various social groups, such as our gender, nationality, religion, occupation, and so on.

Fill in the blank(s) with the appropriate word(s).

A group of researchers wanted to see if sex workers with high levels of motivation are more likely to visit health clinics than are sex workers who are given nothing to motivate them

Whether the workers are motivated or not in such a study reflects the _____ variable. a. independent b. dependent c. extraneous d. qualitative