5. Based on the study design, decide the appropriate procedure: a one-sample (matched pairs) t test for mean difference or a two-sample t test for difference of means. (a) To compare the average weight gain of pigs fed two different rations, nine pairs of pigs were used. The pigs in each pair were littermates. (b) To test the effects of a new fertilizer, 100 plots are treated with the new fertilizer, and 100 plots are treated with another fertilizer. (c) A new fertilizer is tested on 100 plots. Each plot is divided in half. Fertilizer A is applied to one half and Fertilizer B to the other half. (d) Consumers Union wants to compare two types of calculators. They get 100 volunteers and ask them to carry out a series of routine calculations on each calculator. Each calculation is done on each type of calculator, and the time require for each calculation is recorded