1. Which of the following two statements is correct?
2. I.If the population meanand the population standard deviationare both known and a sample of size 16 is taken, one can invoke the central limit theorem and make probability statements about the mean of the sample taken from the population.
3. II. Whenever sample data are used for estimating a population mean or proportion, samplingerror will be present, since the observed sample statistic (or p) will differ from the actual value of the population parameter(or).
4. a.Neither I nor II.
5. b.II.but not I.
6. c.I.but not II.
7. d.Both I and II.
8. 2.Thirty-four percent of Americans say that math is the most important subject in school.In a random sample of 121 Americans,what is the probability that between 30%and 35%will say that math is the most important subject?
9. a.0.291
10. b.0.382
11. c.0.340
12. d.0.709
13. e.0.618
14. 3.Which of the following two statements are correct?
15. I.A typical example of dependent samples occurs with before-and-after measurements for the same individuals or test units.
16. II.A specialhypothesis test, based on the F-distribution, can be appliedto test the null hypothesis that the population variances are equal for two independent samples.
17. a.Both I and II.
18. b.I but not II.
19. c.Neither I nor II.
20. d.II but not I.