Question

Classify each Scenario according to its experimental design. Some categories may contain more than one scenario.

Scenario A: A sample of 100 people was separated into children and adults. The members of each group were randomly assigned to two different hypnosis exercises. The responses of each person were recorded at the completion of the experiment.

Scenario B: A sample of 50 vegetable plants was grouped into pairs of similar individuals based on typeify each and size. Then, within these pairs, each vegetable plant was assigned to a different fertilizer. After three weeks, the responses of each pair were analyzed to compare the effects of the fertilizers.

Scenario C: Twenty race cars were assigned to drive two laps, once with fuel A and once with fuel B. The order of treatments was randomized for each race car. The lap times of each race car were recorded to compare the effects of the two different treatments.

Scenario D: A random sample of 100 lakes was selected in a particular state. To compare the diversity of birds among the lakes, the count and species identity of all birds were recorded for each lake over a 24-hour period.

Scenario E: Eighteen drivers were randomly assigned to three different driving simulations. At the conclusion of each simulation, the performance of each driver was evaluated.
Chose which scenario (A,B,C,D,E)
Completely randomized design SCENARIO_________

Block design (not matched pairs) SCENARIO _________

Matched pairs design SCENARIO ____________

Observational study SCENARIO ___________

Answer 1

The correct answer is option Scenario E. Scenario A: Completely randomized design, Scenario B: Block design (not matched pairs), Scenario C: Matched pairs design, Scenario D: Observational study, Scenario E: Completely randomized design

Step-by-step explanation:

Scenario A: This scenario represents a completely randomized design. The sample of 100 people was randomly assigned to two different hypnosis exercises, and their responses were recorded.

Scenario B: This scenario represents a blocked design (not matched pairs). The vegetable plants were grouped into pairs based on type and size, and then each pair was assigned to a different fertilizer. The responses of each pair were analyzed to compare the effects of the fertilizers.

Scenario C: This scenario represents a matched pairs design. The race cars were assigned to drive two laps, once with fuel A and once with fuel B. The order of treatments was randomized for each race car, and the lap times were recorded to compare the effects of the two fuels.

Scenario D: This scenario represents an observational study. A random sample of 100 lakes was selected, and the bird diversity was recorded for each lake over a 24-hour period.

Scenario E: This scenario represents a completely randomized design. The 18 drivers were randomly assigned to three different driving simulations, and their performance was evaluated at the conclusion of each simulation.