Bus 215 - Final Review: 2011
Student: _________________________________
1. The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called
2. Which of the following is not an example of attribute data?
3. What type of variable is "projected return on an investment"?
4. When a class interval is expressed as: 50 up to 100,
5. For qualitative data, the relative frequency for a class is computed as
6. What is the following table called?
7. What is the relationship among the mean, median and mode in a symmetric distribution?
8. For an ungrouped data set with an odd number of observations that have been sorted or arrayed from smallest to
largest values, where is the median located?
9. The members of each basketball team wear numbers on the back of their jerseys. What scale of measurement
are these numbers considered?
10. What is the median of 26, 30, 29, 28, 32, 31, 27 and 29?
11. Which statement(s) is/are correct about the t distribution?
12. Which of the following would be used as a point estimate for the population standard deviation ( σ )?
13. The U.S. Federal Aviation Administration reported that passenger revenues on international flights increased
from $600 million in 1985 to $4,800 million in 2005. What is the geometric mean annual percent increase in
international passenger revenues?
14. Sometimes, data has two values that have the highest and equal frequencies. In this case, the distribution of the
data can best be summarized as
15. A row of a stem-and-leaf chart appears as follows: 3 | 0 1 3 5 7 9. Assume that the data is rounded to the
nearest unit.
16. What statistics are needed to draw a box plot?
17. What does the interquartile range describe?
18. What is the value of the Pearson coefficient of skewness for a distribution with a mean of 18, median of 13
and standard deviation of 5?
19. A sample of experienced typists revealed that their mean typing speed is 95 words per minute and the median
is 83. The standard deviation is 18 words per minute. What is the Pearson's coefficient of skewness?
20. A bank wishes to estimate the mean balances owed by customers holding MasterCard. The population
standard deviation is estimated to be $300. If a 97 percent confidence interval is used and an interval of $70 is
desired, how many cardholders should be sampled?
21. For a given confidence interval, what is the interpretation of a 96% confidence level?
22. What kind of distribution is the t distribution?
23. What value does the null hypothesis make a claim about?
24. For a standard normal distribution, what is the probability that z is greater than 1.53?
25. What is the area under the normal curve between z = 0.0 and z = 1.0?
26. Test at the 0.10 level the statement that 55% of those families who plan to purchase a vacation residence in
Florida want a condominium. The null hypothesis is
and the alternate is
.
A random sample of 400 families who planned to buy a vacation residence revealed that 236 families want a
condominium. What decision should be made regarding the null hypothesis?
27. What is the level of significance?
28. If two events A and B are mutually exclusive, what does the special rule of addition state?
29. Which approach to probability is exemplified by the following formula?
Probability of an Event =
Total number of successes
Total possible outcomes
30. For the normal distribution, the mean plus and minus 1.96 standard deviations will include about what percent
of the observations?
31. What is it called when all the items in a population have a chance of being selected in a sample?
32. What is the difference between a sample mean and the population mean called?
33. What is the chart called when the paired data (the dependent and independent variables) are plotted?
34. Which of the following statements regarding the coefficient of correlation is true?
35. What does a coefficient of correlation of 0.70 infer?
36. What is the general form of the regression equation?
37. In the equation
= a + bX, what is
?
38. The Pearson product-moment correlation coefficient, r, requires that variables are measured with:
39. If the correlation between two variables is close to one, the association is
40. A box plot shows
41. A one-tailed sign test is applied to a set of paired data. There were 15 pairs and the 0.10 level of significance
was selected. There were 10 pluses and 5 minuses. What is the decision regarding the null hypothesis?
42. If a test is to be used to test H0: Median equals $15.40 and the alternate hypothesis: Median does not equal
$15.40, what is the critical value of z at the 10% level of significance?
43. Which of the following tests is not a distribution-free test?
44. What is the first step in applying the sign test?
45. If a sign test is applied, what is the null hypothesis for a two-tailed test?
46. What is a null hypothesis for a one-tail sign test?
47. What is the distribution for Spearman's rank correlation?
48. The distribution of the sample statistic (H) for the Kruskal-Wallis test is approximately equal to
49. The scale of measurement for the coefficient of rank correlation (Spearman rs) is the
Use the following to answer questions 49:
The following are the ratings (0 to 4) given by 12 individuals for two possible new flavors of soft drinks.
Wilcoxon rank-sum is to be used. Assume that the "0" is ranked first.
50. At the 0.05 level of significance, what is the decision?
51. Which test for ordinal data should be use if there are 3 separate populations, each with a different sample size.