(i)In a nutrition study, 48 pigs were randomly allocated to one of two supplements to their usual feed. Each pig is housed separately in an individual pen. The percentage weight gains (in kilograms) over a month of supplement are recorded. Identify the studydesign, the outcomeand the analysis that can be carried out. [10]

(ii)Aresearcherisinterestedindeterminingwhether anindividual'sinterestinpolitics was influenced by their 'education' (primary, secondary or third level) and their 'employment status' (employed or unemployed).(a)Howmanyfactorsareusedinthisexperiment?Statethenameofthe factor(s) and the levels of the factor(s).[6]

(b)What is the response variable in this experiment?[3]

(iii)Aresearcherwishestoknowwhetherthereisadifferenceinthenumberof kilometres walked daily by retired and non-retired individuals. The researcher wishes to obtain 50 measurements from each group. Should 50 readings be taken from one retiree and 50 from non-retiree, or should a single reading be taken from each of 50 retirees, and from each of 50 non-retirees? Provide a justification for your choice. [6]