13.40 Does the type of cooking pot affect iron content? Iro
(a) Make a table giving the sample size, mean, and standard deviation for each type of pot. Is it reasonable to pool the variances? Although the standard deviations vary more than we would like, this is partially due to the small sample sizes, and we will proceed with the analysis of variance.
(b) Plot the means. Give a short summary of how the iron content of foods depends upon the cooking pot.
(c) Run the ANOVA. Give the ANOVA table, the F statistics with degrees of freedom and P-values, and your conclusions regarding the hypotheses about main effects and interactions.