1. A company wants to identify which of two production methods has the smaller completion time. One sample of workers is 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. A one-tailed test (lower tail) at a .063 level of significance has a z value of _____.  -1.53
3. A one-tailed test (upper tail) at a .123 level of significance has a z value of _____. 1.16
4. A one-tailed test is a hypothesis test in which rejection region is _____.   in one tail of the sampling distribution
5. A regression analysis between sales (in $1000s) and price (in dollars) resulted in the following equation:
   ŷ = 50,000 − 8x
   The above equation implies that an increase of _____.  $1 in price is associated with a decrease of $8,000 in sales
6. A two-tailed test at a 0.0643 level of significance has z values of _____.  –1.85 and 1.85
7. A Type I error is committed when _____.  a true null hypothesis is rejected
8. As a general guideline, the research hypothesis should be stated as the _____.  alternative hypothesis
9. For a one-tailed test (lower tail) with a sample size of 10 and a .10 level of significance the t value is _____.   -1.383
10. For a two-tailed test with a sample size of 20 and a .20 level of significance, the t value is _____.     1.328
11. If a hypothesis is not rejected at a 5% level of significance, it will ____  also not be rejected at the 1% level
12. If a hypothesis is rejected at a 5% level of significance, it _____  may be rejected or not rejected at the 1% level
13. If a hypothesis test leads to the rejection of the null hypothesis, a _____.   Type I error may have been committed
14. 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
15. In a simple regression analysis (where y is a dependent and x an independent variable), if the slope is positive, then it must be true that _____.   there is a positive correlation between x and y
16. In a two-tailed hypothesis test, the null hypothesis should be rejected if the p-value is ___              less than or equal to α
17. In hypothesis testing, the hypothesis tentatively assumed to be true is _____.  the null hypothesis
18. In the hypothesis testing procedure, α is _____.  the level of significance
19. 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
20. The error of rejecting a true null hypothesis is _____.   a Type I error
21. The least squares criterion is _____   min Σ(yi – ŷi)2
22. The level of significance is symbolized by _____.   α
23. The level of significance is the _____.   maximum allowable probability of a Type I error
24. The proportion of the variation in the dependent variable y that is explained by the estimated regression equation is measured by the _____.   coefficient of determination
25. The standard error of x̄1 – x̄2 is the _____.   standard deviation of the sampling distribution of x̄1 – x̄2
26. Two approaches to drawing a conclusion in a hypothesis test are _____.   p-value and critical value
27. When developing an interval estimate for the difference between two sample means, with sample sizes of n1 and n2, _____.  n1 and n2 can be of different sizes
28. When each data value in one sample is matched with a corresponding data value in another sample, the samples are known as _____   matched samples
29. When the p-value is used for hypothesis testing, the null hypothesis is rejected if _____.                p-value ≤ α
30. When the rejection region is in the lower tail of the sampling distribution, the p-value is the area under the curve _____.     less than or equal to the test statistic
31. Which of the following hypotheses is not a valid null hypothesis?   H0: μ < 0
32. Which of the following is an improper form of the null and alternative hypotheses?                               H0: μ < μ0 and Ha: μ ≥ μ0
33. Which of the following is correct?   SST = SSR + SSE
34. Your investment executive claims that the average yearly rate of return on the stocks she recommends is at least 10.0%. You plan on taking a sample to test her claim. The correct set of hypotheses is _____   H0: μ ≥ 10.0% Ha: μ < 10.0%

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