Question: The following data were recorded in Statistical Methods, 6th ed., by G. Snedecor and W. Cochran (Iowa State University Press, Ames, 1967) and represent the average number of florets observed on plants in seven plots. Each of the plants was planted with either high corms or low corms (a type of underground stem)
Suppose we assume the normal regression model for these data. (a) Produce a side-by-side boxplot for the data.
(b) Treating the Corm High and Corm Low measurements as separate samples, carry out a one-way ANOVA to test for any difference between the population means. Produce the appropriate plots to check for model assumptions.
(c) Now take into account that each plot has a Corm High and Corm Low measurement. Compare your results with those obtained in part (b). Produce the appropriate plots to check for model assumptions. (d) Estimate the correlation between the calculus and statistics marks.