Paired Samples t-Test

Intro Statistics for Social Sciences (Professor April Garcia Peck)

Prepare: Watch the jamovi video lessons for Lesson 11. 

Dataset needed: jamovi Dataset - Lesson 11.omv

Assignment Prompt:

A researcher was interested in testing the effectiveness of a new migraine medication. The researcher recruited a sample of people who suffer from migraines. The volunteers reported every migraine they experienced during a 30-day period. Since they would not receive the medication, they would serve as the Control Group. To test the medication, the researcher recruited another sample of participants to match with every participant from the Control Group. Every volunteer was matched based on the severity of their migraines. The second sample was provided a 30-day supply of the medication and they reported every migraine they experienced while taking the pill. Was the migraine medication successful in reducing the number of migraines in a 30-day period? Test this hypothesis using alpha levels of .01 and .05 (you will compare p to both alphas). 

  Use jamovi to find the answers to the items below:

1. What is t-obtained? Report to 2 decimal places AND include the sign whether it is negative (-) or positive (+).  ______

2. What is the mean for the Experimental Group? (report to 2 decimal places) ______

3. What is the mean for the Control Group? (report to 2 decimal places) ______

4. What is the p-value? (report to 3 decimal places) ______   

This assignment continues on the next page.

5. What is your decision regarding H0 if alpha is .01? (Remember, your conclusion should be 3 statements.)

6. What is your decision regarding H0 if alpha is .05? (Remember, your conclusion should be 3 statements.)