Aproblem encountered when the drug under study causes many different reactions. a type of study in which researchers examine what happens to a group of people over time. when one variable causes an observed result. when two variables are related to one another in a predictable manner. when the effect of one variable hides the effect of the other variable.

What factor contributed most to the beginning of the women’s rights movement in the united states during the mid 1800s? a dramatic increase in women’s participation in the workforce b a shift in social attitudes brought on by increased sectional tensions c the experience of gender discrimination within reform movements d the granting of voting rights to african american men