Prof Randi Garcia
March 19, 2018
min Q1 median Q3 max mean sd n missing 67 89 93 95 100 91.0625 7.330614 32 0
It seems natural to think that adding the right vitamins to a pig's diet might produce fatter pigs faster. You've decided to study the effects of B12 in two doses (0mg and 5mg). But pigs have bacteria living in their intestines that might prevent the uptake of vitamins, so you decided to give antibiotics to the pigs in one of two doses (0mg or 40 mg). You design your experiment in such a way that 3 piglets are randomly assigned to each of the 4 treatment conditions. You measure their weight every day, and take each pig's average daily weight gain as your final number recorded.
Mantra: An interaction is present if the effect of one factor is different across levels of the other factor.
For each of the following interaction graphs, answer the following questions with YES or NO.