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You wonder if TV ads are more effective when they are longer or repeated more often

or both. So you design an experiment. You prepare $30$-second and $60$-second ads for a

camera. Your subjects all watch the same TV program, but you assign them at random

to four groups. One group sees the $30$-second ad once during the program; another sees

it three times; the third group sees the $60$-second ad once; and the last group sees the

$60$-second ad three times. You ask all subjects how likely they are to buy the camera.

Which of the following best describes the design of this experiment?

a. This is a randomized block design, but not a matched pairs design.

b. This is a matched pairs design.

c. This is a completely randomized design with one explanatory variable (factor).

d. This is a completely randomized design with two explanatory variables (factors).

e. This is a completely randomized design with four explanatory variables (factors).

Step by step solution

01

Given information

We have been given four options from which we have to select the correct one.

a. This is a randomized block design, but not a matched pairs design.

b. This is a matched pairs design.

c. This is a completely randomized design with one explanatory variable (factor).

d. This is a completely randomized design with two explanatory variables (factors).

e. This is a completely randomized design with four explanatory variables (factors).

02

Explanation

It is a perfectly randomised design because all individuals were randomly assigned to one of the four groups.This is a completely randomized design with two explanatory variables (factors).

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