Data Analysis and Application

The purpose of the paper is to use linear regression analysis to assess whether or not test performance is affected by anxiety. For that purpose, a researcher conducts a study to see how level of anxiety (A1= low, A2 = medium, A3 = high) predicts exam performance (the dependent variable).

Data File Description

The dataset consists of n = 15 valid cases that correspond to the test scores of 15 subjects, along with the anxiety level for each. The anxiety variable has 3 levels, 1= low, 2 = medium, and 3 = high. The dependent variable Performance , which is measured at the interval level and the independent variable is Anxiety , which is measured at the ordinal level.

Testing Assumptions [multiple paragraphs]

The main assumptions of the regression model are that there is a linear association between the dependent variable and the predictors, and that the error term of the model is normally distributed with constant variance. The plot below shows a histogram of the dependent variable.

Figure 1. Histogram of Performance

Price: $13.47

Solution: The downloadable solution consists of 7 pages, 647 words and 5 charts.
Deliverable: Word Document