How can I answer Question 4, 5 and 6.

Download the excel file: EQ Groups.csv and notice how the data are organized. Open the file in JASP. Add value labels for the two groups: 1 = Age 15, 2 = Age 20. To Run the t-test: Click on "t-tests" at the top. Under "classical", select "independent sample t-test." Move your dependent variable into the variables box. Move your independent variable into the "grouping variable" box. Under Alt. Hypothesis, select "Group 1