For Exercise 12.77, and using the levels of the

“shopping bag carried” factor as the horizontal axis and

“seconds” as the vertical axis, plot and connect the cell means for the cells associated with the “sloppy” level of the dress factor. On the same graph, plot and connect the cell means for the cells associated with the “casual” level of the dress factor. Do a third plot, connecting the cell means for cells associated with the “dressy” level of the dress factor. Do the plots indicate the presence of interaction between the factor levels?