No plagarized

1. Define the focus of the observation study in quantitative research.

2. What is the difference between proportional stratified sampling and stratified random sampling? And give an example of each.

3. In experimental design, define each of the following variables:

**Independent variable:**

**Dependent variable:**

**Confounding variable:**

**4. **In experimental design, define each of the following groups:

**Control group:**

**Treatment group (experimental group):**

**5. Define the Internal validity of an experimental study**

**6. ****“There will be differences in degree of mood elevation seen in depressed clients after receiving either cognitive-behavioral or psychoanalytic therapy.” During a test of this hypothesis, it was discovered that some of the participants were males and the others are females.**

In this hypothesis if any, the independent variable(s) is /are___

In this hypothesis if any, the dependent variable(s) is /are ____

In this hypothesis if any, the confound variable(s) is /are_______

**Q7. “There will be differences in degree of mood elevation seen in depressed clients after**

**receiving either cognitive-behavioral or psychoanalytic therapy.”**

In this hypothesis if any, the independent variable(s) is /are_______

In this hypothesis if any, the dependent variable(s) is /are __

In this hypothesis if any, the confound variable(s) is /are_______**_**______

**Q8. “There will be differences in degree of mood elevation seen in depressed clients after receiving either cognitive-behavioral or psychoanalytic therapy.” During a test of this hypothesis, it was discovered that some of the participants lived with family members and others lived alone.**

In this hypothesis if any, the independent variable(s) is/are ___

In this hypothesis if any, the dependent variable(s) is /are____

In this hypothesis if any, the confound variable(s) is/are __

**Q9. Dr. Dow Jones wants to know whether a problem-based approach to teaching economics**

**will result in higher academic performance than his traditional method. Of the six sections of**

**Economics 101 at his university, Dr. Jones arbitrary assigns three sections to the traditional**

**method and three sections to the problem-based method. At the end of the semester, all students**

**complete the same**** ****final exam****.**

This study employs a____**__________________________** __design.

The basic format for this design is:

In this design, __ **______________**_ constitute the control group.

In this design, __ **______________________-** constitute the treatment group.

In this hypothesis if any, the independent variable(s) is/are ___

In this hypothesis if any, the dependent variable(s) is /are___**__**

n this hypothesis if any, the confounding variable(s) is/ are _____

10.

In a study regarding the relationship between variable x and variable y, the researcher selected a random sample of 20 cases and wanted to test for correlation between x and y. Calculate the Pearson correlation coefficient r (using Excel), and the t-test statistic for testing

H0 Population correlation =0 VS Ha Population Correlation ≠ 0 using formula

T=r/Sqrt((1 – r^2)/(n-2)) for the following data

X |
12 |
13 |
14 |
16 |
17 |
18 |
21 |
24 |
26 |
30 |

Y |
35 |
30 |
28 |
25 |
26 |
21 |
19 |
17 |
15 |
10 |

X |
12 |
13 |
14 |
16 |
17 |
18 |
21 |
24 |
26 |
30 |

Y |
35 |
30 |
28 |
25 |
26 |
21 |
19 |
17 |
15 |
10 |

**Answer: r= T=**

Test Conclusion:

Note: If the T value is between -2 and 2 we do not reject H0, otherwise we reject H0

11.