26 students attended a SAT training class, and their SAT test scores taken befor

Question

26 students attended a SAT training class, and their SAT test scores taken before and after having the class is reported in the hyperlinked data file here. The 90%confidence interval for the difference in means is close to between ____.

1670

E. 25 and 68

Before After 1570 1690 1200 1340 1670 1850 1580 1640 1370 1370 1710 1750 1690 1800 1400 1560 1920 1810 1500 1370 1490 1590 1620 1800 1510 1560 1270 1300 1510 1540 1570 1550 1430 1380 1410 1570 1720 1710 1590 1600 1560 1630 1520 1520 1370 1390 1640 1760 1420 1250 1550

1670

Explanation / Answer

The statistical software output for this problem is:

Paired T confidence interval:
?D = ?1 - ?2 : Mean of the difference between After and Before
90% confidence interval results:

Hence,

90% confidence interval is close to 15 and 78

Option D is correct.

Difference Mean Std. Err. DF L. Limit U. Limit After - Before 46.538462 18.413559 25 15.08551 77.991413

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