Use this information to answer the next three questions.
a poultry specialist is conducting an experiment to determine whether the mean cholesterol content of egg yolks is affected by adding certain chemicals to the feed given to the hens laying those eggs. the 120 laying hens available for the study will be randomly allocated to three groups. each group of hens will be fed a ration with a different chemical additive and the cholesterol content of their eggs will be measured.

1. what is the explanatory variable, and is it quantitative or categorical?
a. number of laying hens in each group which is categorical
b. cholesterol content of the hens’ eggs which is categorical
c. cholesterol content of the hens’ eggs which is quantitative
d. number of laying hens in each group which is quantitative
e. type of chemical additive to the group of hens’ feed which is categorical
f. type of chemical additive to the group of hens’ feed which is quantitative
g. breed of chicken which is categorical
h. breed of chicken which is quantitative

2. what is the response variable, and is it quantitative or categorical?
a. cholesterol content of the hens’ eggs which is categorical
b. breed of chicken which is quantitative
c. cholesterol content of the hens’ eggs which is quantitative
d. breed of chicken which is categorical
e. number of laying hens in each group which is categorical
f. type of chemical additive to the group of hens’ feed which is categorical
g. number of laying hens in each group which is quantitative
h. type of chemical additive to the group of hens’ feed which is quantitative

3. which procedure should be used for this test? a. matched pairs t-test for mean differenceb. one-sample t-test for mean (but not matched pairs)c. regression analysisd. two-sample t-test for meanse. chi-square testf. analysis of varianceg. one-sample z-test for proportionh. two-sample z-test for proportions