2) In the following hypotheses, identify the independent and dependent variables, two or three possible values for each variable, and the direction of the relationship. Then suggest two control variables for each hypothesis:

i Death rates in automobile accidents are higher in less densely populated areas.

ii The higher the average driving speed on a highway, the higher the automobile death rate on that highway.

iii Defendants with records of alcohol abuse are more likely to miss scheduled court appearances.

iv Parents of elementary and high school students are more satisfied with their childrens schools than are parents of junior high students.

Revise hypotheses i and iii to improve them.