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Compute the standard deviation for the pretest and posttest scores that were used in problems 2.6 and 3.12. The scores are reproduced here. Taking into account all of the information you have on these variables, write a paragraph describing how the sample changed from test to test. What does the standard deviation add to the information you already had? 4.6 _ Case Pretest Posttest 12 19 17 15 f the gov eau eved 20
math   Statistics-And-Probability   
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solubion Об-72. .46 S.4429 1.333 - 2. 333 10 32.49 o 667 o 667 6. 3 33 6-449 IO 3 4 333 18.17 ч 32 ll49 13.446 1S 13 3.66 -S 333 o.661 I.33 3 567 о.Чу서 t- 796 7- 1129 lo ax-3)-83.33 3T333 、/ 183, 333 s - 3496 12- 1333 13 - 6.933 3 6 0 66 4.1333 12. 3 6.864 17 16.S3to 0 1333 o 84l0 3.34 13 333 5.7333 -DT33320 7,066ג 7,9333 2.66 41.138 1 62.9372. 4.2712 IJ -1 733 3 3.36 49,9382 lS - 12.9333 , *0-9333 I5

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