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QNT275 Final Exam

1. The regression model y = A + Bx+ e is:
2. The mean of a discrete random variable is the mean of its:
3. The p-value is the:
4. A quantitative variable is the only type of variable that can:
5. To make tests hypotheses about more than two population means, we use the:
6. In a survey regarding job satisfaction, 574 in a sample of 934 female job-holders stated that they are satisfied with their jobs, while 500 in a sample of 755 male job-holders stated that they are satisfied with their jobs. The null hypothesis is that the proportions of all female and male job-holders who are satisfied with their jobs are the same. The alternative hypothesis is that the proportion of female job-holders who are satisfied with their jobs is lower than the proportion of male job-holders stated who are satisfied with their jobs. The significance level is 2.5%. What is the critical value of z for the hypothesis test?
7. In a game of four-handed Hearts, all 52 cards of a standard deck are dealt, so that each player starts each round with 13 cards in a hand. Suppose player A’s hand has three clubs, six diamonds, two hears, and two spades. What is the relative frequency of spades, rounded to two decimal places, dealt to player A?
8. Two events are independent if the occurrence of one event:
9. The model y = A + Bx is a:
10. For a goodness-of-fit test, the frequencies obtained from the performance of an experiment are the:
11. Which of the following pairs of events are mutually exclusive?
12. A researcher wants to test if the mean annual salary of all lawyers in a city is different than $110,000. The null hypothesis for this example will be that the population mean is:
13. A qualitative variable is the only type of variable that:
14. For the one-tailed test, the p-value is:
15. Which of the following assumptions is not required to use ANOVA?
16. The alternative hypothesis is a claim about a:
17. In a one-way ANOVA, we analyze only one:
18. In a hypothesis test, a Type I error occurs when:
19. A continuous random variable x has a right-skewed distribution with a mean of 80 and a standard deviation of 12. The sampling distribution of the sample mean for a sample of 50 elements taken from this population is:
20. Two paired or matched samples would imply that:
21. The mean of a discrete random variable is its:
22. An error that occurs because of chance is called:
23. A researcher wants to test if elementary school children spend less than 30 minutes per day on homework. The alternative hypothesis for this example will be that the population mean is:
24. For small degrees of freedom, the chi-square distribution is:
25. A sample of 16 from a population produced a mean of 86.9 and a standard deviation of 14.3. A sample of 18 from another population produced a mean of 75.4 and a standard deviation of 15.9. Assume that the two populations are normally distributed and the standard deviations of the two populations are equal. The null hypothesis is that the two population means are equal, while the alternative hypothesis is that the mean of the first population is greater that the man of the second population. The significance level is 1%.
26. What is the critical value of t for the hypothesis test?
27. If you divide the number of elements in a sample with a specific characteristic by the total number of elements in the sample, the dividend is the:
28. You toss a coin nine times and observe 3 heads and 6 tails. This event is a:
29. We can use the analysis of variance procedure to test hypotheses about:
30. In a hypothesis test, a Type II error occurs when: