7. A psychologist is interested in his new learning program. 10 Subjects learn a list of words. Learning performance is measured using a recall test. After the first test all subjects are instructed how to use the learning program and then learn a second list of words, Learning performance is again measured with the recall test. In the following table the number of correct remembered words are listed for both tests Subject Score Before Program Score After Program 24 26 17 24 32 31 14 16 22 26 19 19 22 a) Construct the 95% confidence interval for true mean difference between the score before the program and the score after the program. b) Write down relevant hypothesis to test on the claim of "There is no significance difference between the score before the program and the score after the program". c) Test the above mentioned hypothesis at 5% sig. level and interpret your results