State the null and alternative hypotheses for each of the following
a. You want to show an increase in buying and selling of single-family homes this year when compared with last year's rate.
b. You are testing a new recipe for low-fat? cheesecake and expect to find that its taste is not as good as traditional cheesecake
c. You are trying to show that music lessons have a positive effect on a child?s self-esteem
d. You are investigation the relationship between a person?s gender and the automobile he or she drives-specifically you want to show that males tend to drive truck type vehicle more than females do.