2. A researcher wants to compare the average weight gain of two different types of feed (Feed A and Feed B) for a group of growing pigs. They randomly assign 30 pigs to each feed group and measures their weight gain in kg at the end of a 4-week period. Use the R output on the following page to answer -

(a) What is a suitable null/alternative hypothesis for the research question: Is there any difference between feed A and feed B in terms of weight gain?

(b) Describe the location, shape and spread of each group

(c) Discuss the assumptions

(d) How do we interpret the p-value?

(e) How do we interpret the confidence interval? (f) How do we interpret the sample means?