Treatment	Opt1	Opt2	Opt3	Opt4	Opt5	Opt6	Opt7				Opt1	Opt2	Opt3	Opt4	Opt5	Opt6	Opt7			GIT_1-3	GIT_4-6				Ttest
0	-2	-3	-3	3	1	-3	-2			Opt1	1														1.984467
0	-2	-3	-2	3	-3	-3	0			Opt2	0.392254	1													0.038632
0	-3	-3	-3	3	-1	0	0			Opt3	0.653662	0.406735	1												0.196551
0	-2	-2	-2	3	-1	-3	1			Opt4	0.040444	0.199065	0.287404	1
0	2	-2	-3	-2	-3	0	1			Opt5	0.166314	0.144323	0.135552	0.004724	1
0	0	-2	-1	1	3	0	-1			Opt6	0.439532	0.484617	0.495221	0.036003	0.071706	1
0	-1	-2	-1	3	0	-1	-1			Opt7	0.547747	0.459113	0.599618	0.299581	0.06756	0.324286	1
0	0	-1	0	1	1	-1	-1
0	-1	-1	-1	3	1	-2	1
0	0	0	0	0	1	0	0
0	-1	-2	2	3	0	-1	-1
0	-1	2	-1	2	1	-1	-1
0	-1	-1	1	3	3	-2	1
0	1	-1	-1	2	2	-3	3
0	0	-3	2	3	1	-3	3
0	-1	1	-1	3	-3	-2	2
0	0	0	1	1	0	-1	1
0	-1	2	-2	3	1	0	1
0	-1	1	-1	3	1	1	0
0	1	-2	1	1	0	1	1
0	1	-1	1	3	1	-1	0
0	-3	3	-1	3	1	3	-2
0	1	-1	1	3	2	-1	1
0	-1	-1	1	3	2	1	2
0	1	-2	2	1	-2	1	2
0	1	0	1	2	-1	1	0
0	1	-1	2	3	1	2	-1
0	2	1	2	1	2	-1	1
0	1	2	2	3	1	1	-2
0	1	2	2	3	3	-2	1
0	2	1	1	3	1	-1	1
0	2	1	1	3	3	-2	2
0	1	-1	2	3	2	1	1
0	1	1	2	3	1	-2	3
0	1	1	2	3	2	0	2
0	1	1	2	1	0	2	2
0	1	2	1	2	3	2	1
0	1	3	1	3	3	-1	3
0	1	2	1	3	1	1	2
0	3	1	2	3	-1	-1	2
0	0	3	1	3	1	1	3
0	1	2	2	3	-1	1	2
0	2	2	2	3	-1	0	2
0	2	1	3	3	3	1	3
0	2	2	3	3	0	2	3
0	0	3	3	3	0	3	3
0	2	2	3	3	1	2	3
0	3	2	3	3	3	2	3
0	3	3	3	3	3	2	3
0	2	3	3	3	2	3	3
1	-3	-3	-3	1	2	-3	-3
1	-3	-3	-2	2	1	-3	-3
1	-2	-2	-2	-1	3	-2	-1
1	-2	-2	-3	1	1	-2	-1
1	-3	-2	-3	3	2	-1	-1
1	-1	-1	-1	1	3	-3	-1
1	-1	-1	-2	3	3	-3	-2
1	-1	-2	-2	3	1	-1	-2
1	1	-1	-1	0	-2	-1	-2
1	0	-1	-1	-2	1	2	-2
1	-3	1	-2	3	-2	-2	-1
1	-1	-3	-1	3	-2	-3	1
1	0	-2	-1	3	-1	-3	0
1	-1	-2	1	3	3	-3	-1
1	-2	3	-2	2	-2	-3	0
1	-1	-1	-1	1	3	-1	1
1	-2	2	-1	2	3	-2	-1
1	-1	-1	-1	2	3	-1	0
1	1	-3	2	3	-1	-3	-1
1	1	-1	-2	3	0	-2	0
1	-1	-1	-1	3	-3	-1	1
1	0	1	-1	2	3	-1	-1
1	1	2	-1	-1	3	-3	2
1	0	0	0	0	2	0	0
1	-1	1	-1	3	-3	-2	0
1	-1	1	-1	2	-2	-1	0
1	1	-1	-1	1	3	2	-1
1	-2	-2	1	3	2	1	0
1	2	-1	0	2	-1	0	-1
1	0	1	-3	3	2	1	0
1	-1	1	-1	3	2	-1	1
1	1	-1	1	1	-1	1	-1
1	-1	1	-1	3	3	-1	1
1	-1	1	0	3	-1	-1	1
1	1	-2	1	3	3	-1	1
1	2	-2	1	3	1	-1	1
1	-2	2	1	2	-3	2	0
1	-2	-2	3	3	-1	0	3
1	0	0	2	1	2	2	1
1	1	-1	2	3	1	1	1
1	1	1	1	3	2	-1	2
1	2	0	2	3	2	-1	2
1	1	1	1	3	1	2	1
1	1	2	3	3	3	-1	2
1	2	1	-2	3	2	3	3
1	0	1	2	3	1	2	3
1	2	2	3	3	0	3	1
1	3	3	2	3	2	3	1
1	3	2	3	3	1	2	3
1	3	3	3	3	2	3	3

This is a set of data from 100 people who completed a scale designed to measure optimism. The first item (column 1) is "Treatment" and refers to 50 people who were given no training in how to be optimistic (a control group - labeled with a zero) and 50 people who went through an optimism training program (labeled with a one). The next 7 columns each represent the 7 questions from the optimism scale.

The items are:

1. In uncertain times, I usually expect the best
2. It's easy for me to relax
3. I'm always optimistic about my future
4. I enjoy my friends a lot
5. My life doesn't suck too much
6. I don't get upset too easily
7. Overall, I expect more good things to happen to me than bad

The participants rated each question on a -3 (definitely not) to a +3 (definitely) scale. The researcher believes that their "optimism program" helps people become more optimistic. The null hypothesis is thus that no difference exists between the treatment and control groups.

For this assignment I want you to answer the following questions:

1. Are any of the seven optimism-scale questions "bad"? Tell me which one, and tell me how you know it's bad. (Hint: there is 1 bad question). - 4 points
2. Run a split-half correlation on the remaining 6 items. What is the correlation? Does this indicate that the scale is acceptable? - 4 points
3. Run a t-test to see if there is a difference between the control group and the treatment group. What is the t-value, and should you "reject the null hypothesis"? - 2 points

A couple more hints...

After reading the items you should see that you don't need to reverse code anything.The data is already "clean"