1. A company wants to identify which of two production methods has the smaller completion time. One sample of workers is matched randomly selected and each worker first uses one method and then uses the other method. The sampling procedure being used to collect completion time data is based on _____ samples.   Matched
2. An insurance company selected samples of clients under 18 years of age and over 18 and recorded the number of accidents they had in the previous year. The results are shown below     less than .001
3. If the alternative hypothesis is that proportion of items in population 1 is larger than the proportion of items in population 2, then the null hypothesis should be  p1-p2 ≤ 0
4. If we are interested in testing whether the proportion of items in population 1 is larger than the proportion of hypothesis items in the   alternative hypothesis should state P1 – P2 > 0
5. In testing the null hypothesis H0: μ1 – μ2 = 0, the computed test statistic is z = -1.66. The corresponding p-value is _____.  .0485
6. Independent simple random samples are selected to test the difference between the means of two populations whose variances are not known. The sample sizes are n1 = 32 and n2 = 40. The correct distribution to use is the _____ distribution.    t
7. Refer to Exhibit 10-1. The point estimate of the difference between the means of the two populations (Male – Female) is _____.   3
8. Refer to Exhibit 10-1. The p-value is _____.  .0668
9. Refer to Exhibit 10-10. The standard error of pbar1-pbar2 is _____.  52
10. Refer to Exhibit 10-11 and let pu represent the proportion under and po the proportion over the age of 18. The null hypothesis is   pu-po=o
11. Refer to Exhibit 10-11. The pooled proportion is _____.   .300
12. Refer to Exhibit 10-12. The point estimate for the difference between the proportions is _____.   -.02
13. Refer to Exhibit 10-13. The null hypothesis for this test is _____.  u1-u2 = 0
14. Refer to Exhibit 10-13. The p-value is _____.  .007
15. Refer to Exhibit 10-13. The test statistic has a value of ______.  2.7
16. Refer to Exhibit 10-2. Based on the results of the previous question, the _____.  null hypothesis should not be rejected
17. Refer to Exhibit 10-2. The null hypothesis to be tested is H0: μd = 0. The value of the test statistic is _____.  0
18. Refer to Exhibit 10-3. The standard error of xbar1-xbar2 is _____  2
19. Refer to Exhibit 10-3. The test statistic for the difference between the two population means is _____.  -3
20. Refer to Exhibit 10-5. If the null hypothesis is tested at the 5% level, the null hypothesis _____.  should not be rejected
21. Refer to Exhibit 10-5. The 95% confidence interval for the mean of the population of differences is _____.  -3.776 to 1.776
22. Refer to Exhibit 10-6. A 95% confidence interval estimate for the difference (Store’s Card – Major Credit Card) between the average purchases of the customers using the two different credit cards is _____.  11.68 to 18.32
23. Refer to Exhibit 10-6. A point estimate for the difference between the mean purchases of the users of the two credit cards (Store’s Card – Major Credit Card) is _____.    15
24. Refer to Exhibit 10-7. A point estimate for the difference between the two sample means (Downtown Store – North Mall Store) is _____.  1
25. Refer to Exhibit 10-8. A point estimate for the difference between the two sample means (Company A Company B) is _____ .50
26. Refer to Exhibit 10-8. The p-value is _____.  .0026
27. Refer to Exhibit 10-8. The value of the test statistic is _____.  3.01
28. Refer to Exhibit 10-9. The mean of the differences (Manufacturer A – Manufacturer B) is _____.  2.0
29. The results of a recent poll on the preference of shoppers regarding two products are shown below.   -.024 to .064
30. The sampling distribution of pbar1 – pbar2 is approximated by a _______   normal distribution
31. the standard error of xbar1-xbar2 is the _____  standard deviation of the sampling distribution of xbar1-xbar2
32. To compute an interval estimate for the difference between the means of two populations, the t distribution _____.  is not restricted to small sample situations
33. We are interested in determining if the accident proportions differ between the two age groups. Refer to Exhibit 10-11. The value of the test statistic is _____.  3.96
34. When each data value in one sample is matched with a corresponding data value in another sample, the samples are known as _____.  matched samples

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