The state of California has a __________ form of government

To promote general welfare, governments use __________ transfers from taxpayers to people who are regarded as deserving

Fill in the blank with the right word.

If you are interested in any possible interaction effects between an extraneous variable and the independent variable, which of the following techniques you should use?

a. matching by holding the extraneous variable constant b. matching by making the extraneous variable into another independent variable c. matching by equating participants d. counterbalancing