A fast food franchise is test marketing three new menu items. To determine the relative popularity of the items, five restaurants were randomly chosen for participation in the study. Each restaurant sold all three new menu items, one per week, over a three week period. The sales volume, in number of units, was recorded for each item at each restaurants. Assume that the distributions of sales for each combination of restaurants and menu item is normally distributed with a common variance

A) what would need to be true for this to be a randomized block design

B) identify the response variable, treatment factor, blocking factor and experimental units