Question

1. Researchers believe that the action theory has implication merits in terms of improving academic achievements. An intervention has been designed based on the action theory and implemented on 8 students in an attempt to enhance their grade in Experimental Psychology class. Before the intervention, the experimenter used a set of 20 questions randomly selected from GRE Psychology Subjective question bank to assess students’ understanding of fundamental concepts in psychology. The grade is based on a 0-20 scale, a higher number indicating a higher grade and better academic achievement. After 6-week intervention, the experimenter tested the same group of students with the same 20 questions to assess the grade change (if any). (12 pts)

The grades are below:

Subjects	Pre-intervention	Post-intervention
1	5	6
2	7	7
3	9	12
4	5	5
5	9	10
6	7	8
7	8	13
8	4	5

Be sure to include the following parts:

1. State the null and alternative hypothesis. (1 pts)
2. Report df and critical values. (1 pts)
3. Calculate the value of your test statistic from the data. (6 pts)
4. Evaluate your hypotheses and make statistical decision. (2 pts)
5. Interpret the results and answer the research question - Does this intervention improve students’ grade in Experimental Psychology class? (2 pts)

Answer 1

Here we conduct one tailed Paired T-test as :

Hence, there is enough evidence to conclude that Intervention improves students’ grade in Experimental Psychology class.