A marketing manager for a cereal manufacturer selects a simple random sample of customers who shop at various local grocery stores. The customers are contacted and asked how much they spend each month on organic cereals. From the responses, the average amount spent on organic cereals is computed and will be used as an estimate of the average amount spent on organic cereals by all residents of the city who shop for groceries.

If the manager took repeated samples such as the one described above and computed the average amount spent on organic cereals for each one, these average amounts would display:

• A.Strata
• B.Cluster samples
• C.A census
• D.Sampling variation
• E.A systematic sample