Question

An experiment is designed to determine if reducing the percentage of sugar in a popular snack will affect the amount of the snack in ounces a person will eat. One hundred volunteers are told they are participating in a movie review and will receive unlimited snacks while watching the movie. At the end of the movie, the amount of the snack eaten by each person will be recorded. The volunteers are randomly assigned to one of four groups. Group I will receive the current version of the snack. Group II will receive the snack with a 5% reduction in sugar. Group III will receive the snack with a 10% reduction in sugar. Group IV will receive the snack with a 20% reduction in sugar. Identify the experimental design, the explanatory variable, and the response variable.

A) A block design with 4 blocks, the percentage of sugar, the amount of the snack eaten B) An observational study, the percentage of sugar, the amount of the snack eaten. C) A completely randomized design, the percentage of sugar, the amount of the snack eaten. D) A block design with 4 blocks, the volunteers watching the movie, the percentage of sugar E) A completely randomized design, the volunteers, the percentage of sugar

Answer 1

Ans:

Option C is correct.

A completely randomized design, the percentage of sugar, the amount of the snack eaten.

A completely randomized design is the simplest experimental design, in terms of data analysis and convenience. With this design, subjects are randomly assigned to treatments.. The experimenter assumes that, on average, extraneous factors will affect treatment conditions equally; so any significant differences between conditions can fairly be attributed to the independent variable.