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- From: Mathematics, Statistics and Probability
- Posted on: Thu 21 Jan, 2016
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1. To use ANOVA, the dependent variable must be measured at an interval or ratio level. (Points : 2)
a. True
b. False
3. ANOVA is a procedure for comparing three or population means. (Points : 2)
a. True
b. False
4. The symbol for “level of significance” is: (Points : 2)
a. ß
b. µ
c. ?
d. s
15. Data that use numbers to provide categories or labels as well as the ordering of the categories are: (Points : 2)
a. Nominal
b. Ordinal
c. Ratio
d. Interval
16. A set of subjects, usually randomly sampled, selected to participate in a research study is called: (Points : 2)
a. Population
b. Sample
c. Mode group
d. Partial selection
17. In a time series analysis, the trend analysis procedure is analogous to regression analysis except that the x-variable is always some measure of “time.” (Points : 2)
a. True
b. False
18. If you determine that the upper and lower limits of a 99% confidence interval are 50 and 60, you can conclude that there is a 99% chance that the sample mean is between 50 and 60. (Points : 2)
a. True
b. False
19. The formula for ____________ is (Row total X Column total)/T (Points : 2)
a. Observed frequencies
b. Degrees of freedom
c. Expected frequencies
d. Sampling error
20. When you are estimating a population parameter, the larger the sample size: (Points : 2)
a. The larger the sampling error
b. The larger ? will be
c. The larger your sample statistic will be
d. The more accurate your estimate will be
21. The owner of a five fast-food restaurants wants to determine whether there is any difference among the five stores with respect to the average time it takes to fill an order at the drive-thru. He collects data (i.e., the total time between placing their order and picking up the order) on a random sample of 20 customers at each of the 5 stores at approximately the same time on the same day of the week. What statistical test/procedure should he use? (a = .01) (Points : 5)
a. Chi-Square
b. Regression Analysis
c. Confidence Interval
d. ANOVA
22. Two competing ice cream stores, Yum-Yum and Goody, both advertise quarter-pound scoops of ice cream. There is some concern about the variability in the serving sizes, so two members of a local consumer group have sampled 25 scoops of Yum-Yum’s ice cream (x? = 25, s2 = 16) and 11 scoops of Goody’s (x? = 25, s2 = 10). What formula would you use to determine if there is a difference in the variation of ice cream weights between Yum-Yum and Goody? Use a = 0.10. (Points : 5)
a. ? = b0 + b1x
b. t = ((x? - ?) - x-bar) ÷ s/?n
c. F = s12 ÷ s22
d. x? - t(s ÷ ?n) < µ < x? + t(s ÷ ?n)
5. When conducting an hypothesis test, if z calculated is < z critical, you should accept the null hypothesis:
(Points : 2)
a. True
b. False
6. The arithmetic average of the data is called the:
(Points : 2)
a. Mean
b. Median
c. Mode
d. Variability
7. If the null hypothesis states that µ ? $50 lbs., then the test is two-tailed.
(Points : 2)
a. True
b. False
8. When conducting an ANOVA, if the results are statistically significant, further tests must be performed in order to determine which population means are significantly different.
(Points : 2)
a. True
b. False
9. The Chi-square test for independence compares observed frequencies with:
(Points : 2)
a. Expected frequencies
b. Standard deviations
c. Standard errors
d. Phi coefficient
10. The standard deviation is:
(Points : 2)
a. The difference between the 3rd and 1st quartile
b. The squared deviations from the mean
c. The difference between the highest and lowest scores
d. The average distance of individual scores from the mean
11. If the slope (b1) of a regression equation is -3.4 that means the:
(Points : 2)
a. Points on the scatter plot are all very close to the regression line
b. Pattern of the points on the scatter plot is moving downward from left to right
c. Relationship between x and y is relatively weak
d. Regression line crosses the y-axis at (0, -3.4)
12. A binomial probability distribution is a discrete distribution (i.e., the x-variable is discrete).
(Points : 2)
a. True
b. False
13. If the calculated Chi-Square statistic is less than the table value, we accept the null hypothesis.
(Points : 2)
a. True
False
14. If the results of a statistical analysis show that F calculated is > F critical, then the p-value will be < alpha.
(Points : 2)
a. True
b. False
15. Data that use numbers to provide categories or labels as well as the ordering of the categories are:
(Points : 2)
a. Nominal
b. Ordinal
c. Ratio
d. Interval
Solution Description

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