An experiment was conducted to determine if factor A, time frozen (30 min or 60 min), and/or factor B, topping (cheese only or cheese with pineapple), had an effect on the quality (measured on a scale of 0-100, integers only) of a brand of pizza. The data are given below in the table.

(a) Identify the response variable, factors, factor levels, experimental units, treatments, and replicates.

(b) Specify the four sources of experimental error and give an example of each in context of the problem.

Pizza Quality Rating Time Topping 77 30 Cheese 70 30 Cheese 85 30 Cheese with pineapple 89 30 Cheese with pineapple OO JO OT A CO N H 62 60 Cheese 65 60 Cheese 75 60 Cheese with pineapple 77 60 Cheese with pineapple