Question

Part I: Between-Groups Design

In the between-groups design, researchers were interested in whether cholesterol levels would differ depending on diet. Twenty participants were randomly assigned to one of two different groups. Group A was assigned a diet rich in fruits and vegetables and with no trans fats. Group B participants were asked to follow their normal diets, which contained varying levels of trans fats depending on the individual. After one month, blood samples were drawn and the following levels of cholesterol were obtained:

Participant	Blood Cholesterol	Diet
1	129	Healthy
2	98	Healthy
3	150	Healthy
4	75	Healthy
5	135	Healthy
6	175	Healthy
7	115	Healthy
8	103	Healthy
9	156	Healthy
10	143	Healthy
11	239	Normal
12	500	Normal
13	350	Normal
14	468	Normal
15	198	Normal
16	213	Normal
17	225	Normal
18	175	Normal
19	560	Normal
20	289	Normal

In 2 to 3 sentences in a Microsoft Word document, answer the following questions:

• What is the independent variable in this study?
• What are the levels of that independent variable?
• What is the dependent variable?

Answer 1

(i) In this study the independent variable is diet. It is not dependent on other variables. It is also called explanatory variable.

(ii) There are two levels in this independent variable (diet).

The levels of that independent variable (diet) is given by

levels label

0 Healthy

1 Normal

(iii) The dependent variable is blood cholesterol.

Because , blood cholesterol is depend on diet they are taking.