Psy 210 Data Analysis Assignment #13 3 Marks
One-Sample T-Test Due: Thurs June 3
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: SPSS
Conduct a one-sample t-test, to test the null hypothesis that students get an average of 8 hours
sleep a night.
Steps:
1. Click on the Analyze menu
2. Click on Compare Means from the drop down menu
3. Click on One-Sample T-Test from the side menu
4. Select the variable “How many hours of sleep did you get last night?”
5. Type in “8” as the Test Value
6. Click OK
7. Title your output
8. Save your output
9. Print your output
Part II: Interpreting your output
Answer the following questions:
1. If a two-tailed test was used, what was the null hypothesis? What was the alternative
hypothesis?
2. What was the mean number of hours of sleep, in this sample?
3. What was the value of t-obtained?
4. How many degrees of freedom did t have?
5. What was the p-value?
6. Would you retain or reject the null hypothesis?
7. What would your research conclusion be? (This is the answer to your Research
Question)
8. Give a 95% confidence interval for the mean. Note, the 95% confidence interval given
by SPSS is NOT the 95% confidence interval for the mean, it is the 95% confidence
interval for the difference between the test value (in this case 5) and the mean. To get
the 95% confidence interval for the mean, you need to add the test value (in this case 5)
to the lower and upper limits given.
WHAT TO HAND IN
Hand in your SPSS Output from Part I and your answers to each of the questions in Part
II.
