1. A new psychopharmacological drug to treat depression will significantly reduc
ID: 3045666 • Letter: 1
Question
1. A new psychopharmacological drug to treat depression will significantly reduce depressive symptoms among patients compared to patients who receive a placebo drug.
Identify the dependent variable (1 point)
Identify the independent variable(s) (1 point)
2. You are a dog trainer who is conducting a study on a new method of dog obedience training involving body language. You are measuring the number of times that it takes a dog to learn a new command and the percentage of time they complete that new command after they’ve learned it.
Identify the dependent variable (1 point)
Identify the independent variable(s) (2 points)
3. A researcher was interested in whether reading comprehension differs among first, second, and third-graders. He assigned 10 children from each grade to read a passage in a children’s book and measured their reading comprehension on a scale of 1 (very poor) to 10 (very good). Here are the data:
First-Graders
Second-Graders
Third-Graders
1
6
10
2
5
8
4
6
9
2
4
9
7
8
5
5
2
4
1
6
8
3
5
7
3
7
9
4
5
10
NOTE: Please compute the totals and Grand Total on your own.
1. Formulate the null hypothesis in symbols and in words (2 points)
2. Formulate the research hypothesis in symbols and in words (2 points)
3. What is the independent variable and what are the levels of the independent variable? (2 points)
4. What is the dependent variable? (1 point)
First-Graders
Second-Graders
Third-Graders
1
6
10
2
5
8
4
6
9
2
4
9
7
8
5
5
2
4
1
6
8
3
5
7
3
7
9
4
5
10
Explanation / Answer
1. Anindependent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.
Hence for this case:
Dependent variable is depressive symptoms among patients
Independent variables are new psychopharmacological drug and placebo drug.
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