A Local Consumer Reporter Wants to Compare the Average Costs

Multiple Choice

A local consumer reporter wants to compare the average costs of grocery items purchased at three different supermarkets, A, B, and C. Prices (in dollars) were recorded for a sample of 60 randomly
Selected grocery items at each of the three supermarkets. In order to reduce item-to-item
Variation, the prices were recorded for each item on the same day at each supermarket. Identify the blocks for this experiment.

A) the day on which the data were collected
B) the three supermarkets
C) the 60 grocery items
D) the 60 × 3 = 180 prices