How would I start this question and answer it? There's too many things happening and I'm confused

20/9.jpg Open with Does practicing questions increase scores for a language exam? To study the effect of practice on the language exam, 22 individuals between 30 to 35 years of age with similar scores in their previous exam were randomly selected; 11 of them were randomly assigned to do practice questions at least 2 hours per day for one month while the others did not do any practice questions during this one-month period. The test scores of the participants are obtained after one months and summary statistics are shown In the following table. Summary statistics Practice questions Did not practice questions Pooled Difference Average 101.07 95.96 5.11 Standard Deviation 2.28 4.67 3.67 1.44 Suppose , and /2 are the respective average scores for participants that had done the practice questions and those that had not do the practice questions. What is the margin of error of the 99% confidence interval for the mean difference in scores between the two groups? (If you think the samples are independent, then do not assume equal variances.) Select one: 3.169 x 0.434 Rooms O 2.576 x 0.434 2.845 x 1.567 O 2.576 x 1.567 3.169 x 1.567 Enat - Q +