I need answers for 2 and 3 but 3 should be done on R studio app and 2 should be done by hand.. i need answers step by step.. and answers should be rounded to 4 decimal places.. it's a biostatistics class... thank you!

2. Four different brands of margarine were analyzed to determine the level of some un- saturated fatty acids (as a percentage of fats). Test to compare the four groups simul- taneously by hand. Use a significance level of 0.05. Only do the ANOVA part of this problem. Brand Fatty acids A 13.5 13.4 14.1 14.2 B 13.2 12.7 12.6 13.9 C 16.8 17.2 16.4 17.3 18.0 D 18.1 17.2 18.7 18.4 3. Do 2 in R and if needed complete the analysis with ttests and conclusions just like being asked for in 1