An educational study was designed to investigate the effectiveness of a reading program of elementary age children. Each child was given a pretest and posttest. Higher posttest scores would indicate reading improvement. From a very large population, a random sample of scores for the pretest and posttest are as follows:Child Pretest Score Posttest Score1 40 482 36 423 324 38 365 436 33 387 35 45Child 3 moved from the school district and did not take the posttest. Child 5 moved into the district after the start of the study and did not take the pretest.Find a 95% confidence interval estimate of the mean improvement in the reading scores.
An educational study was designed to investigate the effectiveness of a reading program of elementary age children. Each child was given a pretest and posttest. Higher posttest scores would indicate reading improvement. From a very large population, a random sample of scores for the pretest and posttest are as follows:
Child Pretest Score Posttest Score
1 40 48
2 36 42
3 32
4 38 36
5 43
6 33 38
7 35 45
Child 3 moved from the school district and did not take the posttest. Child 5 moved into the district after the start of the study and did not take the pretest.
Find a 95% confidence
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