EDR8201 Week 7  Assignment:
Week 7  Assignment: Analyze Differences Between Groups Using Paired and Independent Samples tTest and ANOVA (15 Points)
Part I. Paired Samples tTest
Please enter and analyze the data in the table below in SPSS with appropriate ttest analysis. These data contain changes in selfesteem scores from pretest (before psychological counseling) to posttest (after psychological counseling).
Depression Scale Pretest and Posttest Scores
Participant 
Pretest 
Posttest 
1 
30 
28 
2 
33 
29 
3 
29 
30 
4 
27 
31 
5 
26 
29 
6 
37 
37 
7 
40 
41 
8 
35 
40 
9 
36 
37 
10 
35 
38 
 What are the two main assumptions underlying the repeatedmeasures ttest? Normality of data distribution and the quality of variance in standard deviation. Determine if the assumptions are met.
 Please produce an SPSS output for the pairedsamples ttest comparing the pre and posttest scores.
 Provide the null and alternative hypothesis.
 What are the mean and standard deviation for beginning pretest and end posttest? (Please use APA style.)
 What is the value of the t statistic?
 What is the mean difference?
 What is the standard deviation difference?
 What is the value of Cohen’s d? Is it small, medium, or large?
 What might be concluded from these results? (Hint: The decision about the null hypothesis.)
Part II. Independent Samples tTest
The experimental group received instruction in calculus via the Internet, while the control group received traditional classroom instruction. The data consist of the final examination scores for both groups. Conduct an independentsamples ttest, and then answer the questions that follow.
Group 
Code 
Exam 
Experimental 
1 
30 
Control 
2 
28 
Control 
2 
33 
Experimental 
1 
26 
Experimental 
1 
34 
Control 
2 
34 
Experimental 
1 
37 
Control 
2 
33 
Experimental 
1 
26 
Control 
2 
26 
 There are three main assumptions needing to be satisfied before using the independentsamples ttest for testing differences between the genders.
 Use SPSS to generate the output needed to test the assumptions.
 Please discuss each one and explain whether each assumption has been met using SPSS output as needed to include the ShapiroWilk test for normality (used when the sample size is less than 50), histograms, and the Levene’s test.
 Keep in mind if the population value is unknown, it is permissible to infer from sample values. Regardless of sample size, test whether these assumptions are met.
 Please produce an SPSS output for an independentsamples ttest comparing the experimental and control group in the calculus exam score.
 What are the null and alternative hypotheses?
 What is the mean for the experimental group?
 What is the mean for the control group?
 What is the value of t?
 What is the associated probability?
 Report the results in APA format.
 What might be concluded from this hypothetical study? (Hint: the decision about the null hypothesis)
Part III. Analysis of Variance
You will be entering and analyzing the data in the table below using SPSS. The data contain estimated hours of Internet usage for samples from three socioeconomic status (SES) groups. Name the first variable SES and label it “Socioeconomic Status.” Use the value labels of 3 = High SES, 2 = Middle SES, and 1 = Low SES. Name the dependent variable Internet and label it “Hours of Internet Usage (Weekly).”
Participant 
SES 
Codes 
Hours 
1 
High 
3 
10 
2 
High 
3 
12 
3 
High 
3 
11 
4 
High 
3 
15 
5 
Middle 
2 
14 
6 
Middle 
2 
13 
7 
Middle 
2 
10 
8 
Middle 
2 
12 
9 
Low 
1 
9 
10 
Low 
1 
11 
11 
Low 
1 
8 
12 
Low 
1 
12 
 Using SPSS, conduct a oneway ANOVA to test for differences in hours of Internet usage between the different SES groups. After conducting the ANOVA using SPSS, be sure to present the findings in the SPSS table format.
 What is the mean for the lowSES group?
 What is the mean for the middleSES group?
 What is the mean for the highSES group?
 What is the Fvalue?
 What is the value of the associated probability?
 Report the results in a narrative using APA format.
 What can be concluded from these results? (Hint: The decision about the null hypothesis.)

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Solution: EDR8201 Week 7  Assignment: