Stat 211 Handout 9 (Chapter 9): Inferences Based on Two Samples tests


Brand1 8 38479 37067 5590 1976 32100 48360 34185 43525



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Brand1 8 38479 37067 5590 1976 32100 48360 34185 43525


Brand2 8 37611 36655 5244 1854 31950 47800 33491 41214

Difference 8 868 475 1290 456.1 -805 3020 N/A N/A




Brand1

36925

45300

36240

32100

37210

48360

38200

33500

Brand2

34318

42280

35500

31950

38015

47800

37810

33215

Difference

2607

3020

740

150

-805

560

390

285


99% confidence interval for is =(-727.84 , 2463.84)

Confidence interval only tells us that there is no difference between those brands.


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