Researchers were interested in learning the effects of trans fats on levels of c
ID: 3125091 • Letter: R
Question
Researchers were interested in learning the effects of trans fats on levels of cholesterol in the blood. Two different research designs were constructed.
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
01
129
Healthy
02
98
Healthy
03
150
Healthy
04
75
Healthy
05
135
Healthy
06
175
Healthy
07
115
Healthy
08
103
Healthy
09
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?
Part II: Within-Subjects Design
In the within-subjects design, researchers were interested in whether participants could actually lower their cholesterol levels by changing from a diet higher in trans fats to one with no trans fats. Ten research participants were selected. A baseline measure of cholesterol was taken from each. They were then put on a diet rich in fruits and vegetables and devoid of trans fats for one month. At the end of that month, blood cholesterol was again measured and the following results were obtained:
Participant
Blood Cholesterol
Diet
1
129
Baseline
1
98
Healthy
2
150
Baseline
2
75
Healthy
3
175
Baseline
3
135
Healthy
4
115
Baseline
4
103
Healthy
5
156
Baseline
5
143
Healthy
6
500
Baseline
6
450
Healthy
7
468
Baseline
7
350
Healthy
8
198
Baseline
8
213
Healthy
9
225
Baseline
9
175
Healthy
10
560
Baseline
10
481
Healthy
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?
Participant
Blood Cholesterol
Diet
01
129
Healthy
02
98
Healthy
03
150
Healthy
04
75
Healthy
05
135
Healthy
06
175
Healthy
07
115
Healthy
08
103
Healthy
09
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
Explanation / Answer
Question (1)
1. An independent variable is the variable that is changed or controlled in a scientific experiment.
Independent variables are the variables that the experimenter changes to test their dependent variable.
Here, The Diet influenced on Blood Cholesterol. So Indepdent variable is Diet.
2. There are two levels of Diet one is Healthy another one is Normal.
3. A dependent variable is the variable being tested in a scientific experiment.
The dependent variable is 'dependent' on the independent variable. As the experimenter changes the independent variable, the change in the dependent variable is observed and recorded.
Here Blood Cholesterol is influenced by Diet. So dependent variable is Blood Cholesterol
Question (2)
1. An independent variable is the variable that is changed or controlled in a scientific experiment.
Independent variables are the variables that the experimenter changes to test their dependent variable.
Here, The Diet influenced on Blood Cholesterol. So Indepdent variable is Diet.
2. There are two levels of Diet one is Healthy another one is Baseline.
3. A dependent variable is the variable being tested in a scientific experiment.
The dependent variable is 'dependent' on the independent variable. As the experimenter changes the independent variable, the change in the dependent variable is observed and recorded.
Here Blood Cholesterol is influenced by Diet. So dependent variable is Blood Cholesterol
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