Question

To determine which volunteers would be in the control group and which in the treatment group, researchers generated random numbers 0 or 1 for each person. A 1 indicated treatment group, and a 0 indicated the placebo group. Briefly explain what kind of experimental design this is.

Now suppose instead of this, the researchers first split the volunteers into groups based on age (under 35 vs 35+). Then they assigned people from each age group to the placebo or treatment group so that they could compare treatment vs. Placebo on age as well. Briefly explain what kind of experimental procedure this is.

Answer 1

(1)

Question:

To determine which volunteers would be in the control group and which in the treatment group, researchers generated random numbers 0 or 1 for each person. A 1 indicated treatment group, and a 0 indicated the placebo group. Briefly explain what kind of experimental design this is.

Answer:

Randomized Control Experimental Design

Explanation:
In this experiment, the experimenter randomly assigns participants into either the treatment group or the placebo group. using Simple Random Sampling (SRS).

(2)

Question:

Now suppose instead of this, the researchers first split the volunteers into groups based on age (under 35 vs 35+). Then they assigned people from each age group to the placebo or treatment group so that they could compare treatment vs. Placebo on age as well. Briefly explain what kind of experimental procedure this is.

Answer:

One Factor Randomized Block Design

Explanation:

In the above randomization experimental design, blocking on age (under 35 vs 35+). in order to control the effect of age on the Dependent Variable.