The data in the following table and accompanying computer output come from an animal experiment designed to investigate whether levorphanol reduces stress as reflected in the cortical sterone level. The four treatment groups contained five animals each

a. These data may be analyzed by means of two-way ANOVA. What are the two factors?
b. Classify each factor as either fixed or random.
c. Rearrange the data into a two-way table appropriate for two-way ANOVA.
d. Form the table of sample means, and comment on the patterns observed.
e. Complete the ANOVA table shown below.
f. Analyze the data to determine whether significant main effects exist due to levorphanol and epinephrine and whether a significant interaction effect exists between epinephrine and levorphanol.