exams were as follows: Student 1 First exarí grade X Second The first and second exam grades (X,Y) for a sample of ten 2 38 68 23 28 3 40 -40 41 4 65 1 70 5 61 71 6 50 10 60 10 [XY=31336 7 56 68 8 12 70 74 9 40 4 55 exa.n grade Y D=Y-X -15 5 NOTE: EX²-30775,, [Y²-34560, Give 95% CI for the mean grades of the first Statistics exam? Give the correlation coefficient between the first and the second exam grades? 200 exam grades? ve 95% CI for the difference in mean grades between the second and the first exams? 10 15 55 70 Mean SD 54.3 15 55.0 19.18 11.97 1.7 17.1

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