Question
A psychologist wants to determine whether having a job interferes with student academic performance. She measures academic performance as a grade point average (GPA) on
A psychologist wants to determine whether having a job interferes with student academic performance. She measures academic performance as a grade point average (GPA) on a 4.0 scale, where higher scores indicate better performance. She selects a sample of 30 students - 10 who did not work, 10 who worked part-time, and 10 who worked full-time during the previous semester - and records their GPA. Conduct this analysis using an alpha of .05.
- What is the IV? Levels of the IV? Level of Measurement of the IV?
- What is the DV? Level of measurement of the DV?
- How are subjects assigned to groups?
- Based on your answers to items 1 - 3, what is the correct hypothesis test for analyzing this data?
- Define your variables
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6-mJoin the vectors into a data frame
#Enter code here
## noWork partTime fullTime ## 1 3.4 3.5 2.9 ## 2 3.2 3.6 3.0 ## 3 3.0 2.7 2.6 ## 4 3.0 3.5 3.3 ## 5 3.5 3.8 3.7 ## 6 3.8 2.9 2.7 ## 7 3.6 3.4 2.4 ## 8 4.0 3.2 2.5 ## 9 3.9 3.3 3.3 ## 10 2.9 3.1 3.4
7- What is the shape of your data frame - wide or long?
8- Reshape your data into the long format
#Enter code here
9- Convert your IV into a factor
#Enter code here
10- Create a summary table of the n, mean, and standard deviation of each level of the IV
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11- Conduct your ANOVA
#Enter code here
12- View the summary of the ANOVA
#Enter code here
13- Do we need to conduct post hocs? Explain.
14- Conduct a Tukey HSD
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15- Interpret the post hocs
16- Visualize the 95% CI
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17- Interpret the confidence interval plot.
18.Summarize your results in APA format.
Extra Credit:
Create an error bar graph for this data.
#Enter code here
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