Chapter 4: Q. 117 E (page 284)
Do product labels influence customer perceptions? To find out, researchers recruited more than 500 adults and asked them to estimate the number of calories, amount of added sugar, and amount of fat in a variety of food products. Half of the subjects were randomly assigned to evaluate products with the word 鈥淣atural鈥 on the label, while the other half were assigned to evaluate the same products without the 鈥淣atural鈥 label. On average, the products with the 鈥淣atural鈥 label were judged to have significantly fewer calories. Based on this study, is it reasonable to conclude that including the word 鈥淣atural鈥 on the label causes a reduction in estimated calories?
(a) No, because the adults weren鈥檛 randomly selected from the population of all adults.
(b) No, because there wasn鈥檛 a control group for comparison.
(c) No, because association doesn鈥檛 imply causation.
(d) Yes, because the adults were randomly assigned to the treatments.
(e) Yes, because there were a large number of adults involved in the study
Short Answer
The correct option is (a) No, because the adults weren鈥檛 randomly selected from the population of all adults.

