Psy 210 Data Analysis Assignment #19 3 Marks
Correlation Due: Fri July 11
You may work on this assignment individually or in groups of up to three students.
Use the Recoded Research Data available from Dr. Barchard’s website.
Part I: Using SPSS
Question 1: Draw a scatterplot of the relationship between number of hours spent studying and GPA in
college.
Steps
1. Click on Graphs
2. Click on Scatter from the drop down menu
3. Select Simple Scatterplot
4. Click on Define
5. Select GPA for the Y-axis
6. Select Studying for the X-axis
7. Click OK
8. Edit your graph to make sure that it is well-labeled, and is generally clear and easy to interpret.
Question 2: Calculate the correlation between hours of studying and GPA.
Steps
1. Click on Analyze
2. Click on Correlate from the drop down menu
3. Click on Bivariate from the side menu
4. Select the two variables, studying and GPA
5. Select the Pearson Correlation Coefficient
6. Select a Two-tailed test of significance
7. Click OK
Put a title on your output, print it, and hand it in.
Part II: Interpreting your output
Answer the following questions:
Based on your scatterplot,
is the relationship between studying and GPA linear?
is the relationship positive, negative, or close to zero?
Regarding your calculations,
What is r?
What is your null hypothesis?
What is your alternative hypothesis?
What is your p-value?
Do you retain or reject the null hypothesis?
Answer the following question, based on your findings. If you knew two people, Person A and
Person B, and you knew that Person A studied more, on average, than Person B, who
would you guess would get higher grades – Person A, Person B, or they would get about
the same grades?
WHAT TO HAND IN
