Four types of cereal grain (wheat, barley, oats, and maize) grown in Kansas are analyzed to determine the total thiamin (mg) content it contains. Suppose you wish to test that at least two of the grains differ with respect to true average thiamin content. Assume each sample is from an SRS from its population, groups and observations are independent, observations within each population are normally distributed, and variances of each group are equal.

Which type of test would be appropriate to conduct?

a. ANOVA

b. Wilcoxon Rank Sum Test

c. Two-sample t-test

d. Chi-square test