2. Samples are taken from two populations, A and B, with the following results:

Question

2.Samples are taken from two populations,  A and B,  with the following results:  A B Sample Size 100 200 Sample Mean 25 23 Sample Variance 1.21 1.01 You wish to test this hypothesis at the 1% significant level:   H0:  u1  ? u2    against      H1:  u1 <  u2. What decision rule would you use ? Answer A.   Reject H0 if test statistic > -2.33. B.   Reject H0 if test statistic > 2.33. C. Reject H0 if test statistic < -2.33. D. Reject H0 if test statistic <  2.33.

3.These two data sets are dependent.  Find D, (the sample mean of the paired differences). X 11.8 11.3 10.6 12.9 11.1 Y 10.3 12.6 11.6 10.7 10.0 Answer A. 0.3 B. 0.7 C. 0,5 D. 0.6

Explanation / Answer

1) A. (5.85, 7.73)

2) C. Reject H0 if test statistic < -2.33

3) C. 0.5

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