Aresearcher would use research, if they were interested in determining whether listening to subliminal advertising causes an increase in sales of products.

Experimental research

Explanation:

A researcher would use experimental research, if they were interested in determining whether listening to subliminal advertising causes an increase in sales of products.

Experimental researches are used in study the validity of a scientific hypothesis. The scientific hypothesis in this case is that subliminal advertising causes an increase in sales of product.

The null hypothesis would be; listening to subliminal advertising has no effect on sales of product.

The alternative hypothesis would be; listening to subliminal advertising has effect on sales of product.

it should be c, women were allowed to vote in all states because federal law supersedes state law.

"states can make their own laws, as long as they don't contradict what the federal law states. the states do not have the authority to pass a law that negates a federal law." -google

they all focused on themes about the inevitability of death.