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7. In a situation where in a confidence level .01 what percent of the measurement results are left to chance? (Points : 3)
8. What is the most important ingredient in a statistical testing procedure? (Points : 3)
9. If a production manager wanted to determine whether or not the first shift was processing more widgets than the second shift, what type of statistical process would be used? (Points : 3)
10. What type of t test seeks to determine whether or not a relationship exists in one sample over two conditions? _______________ (Points : 3)
[removed] B, C and F

[removed] The distribution (shape) of the population (e.g., normal, skewed, flat, etc.)

[removed] A, B, E

[removed] H1: There is a significant difference in the teaming behavior before and after the training.




[removed] True

[removed] True 
30. A distribution of 6 scores has a median of 21. If the highest score increases 3 points, the median will become (Points : 3) 
[removed] 21
[removed] 21.5
[removed] 24
[removed] Cannot be determined without additional information
[removed] none of these
34. A graphical presentation may accomplish ALL BUT which of the following objectives? (Points : 3) 
[removed] Illustrate the amount of variation in the data.
[removed] Illustrate approximately where the mean is
[removed] Allow comparison with similar data
[removed] Will have the exact same shape regardless of what units are used on the axes.
35. A coach in a large high school thinks that ballet training will improve the batting performance of his baseball team. He decides to have a randomly selected half of the team take six weeks of ballet training before the baseball season begins, while the other half does not take such training. He will then compare the season batting averages of group A (those with ballet training) and group B (those without ballet training) by comparing the mean of group A with the mean of group B. An independent variable is: (Points : 3) 
[removed] ballet training
[removed] batting average
[removed] runs batted in
[removed] the size of the school
[removed] the grades the players make in the ballet school
36. Word Problems: Based on the data set provided, provide a substantive narrative explanation of the process involved in creating the frequency distribution table and the frequency histogram. Provide as much detail as possible.
The following data represent scores of 50 students in an applied business statistics test.
72 72 93 70 59 78 74 65 73 80
57 67 72 57 83 76 74 56 68 67
74 76 79 72 61 72 73 76 67 49
71 53 67 65 100 83 69 61 72 68
65 51 75 68 75 66 77 61 64 74 (Points : 4)
37. Word Problems: Compute the sample mean, sample median X(M), sample range, and sample variance.
The following data represent scores of 50 students in an applied business statistics test.
72 72 93 70 59 78 74 65 73 80
57 67 72 57 83 76 74 56 68 67
74 76 79 72 61 72 73 76 67 49
71 53 67 65 100 83 69 61 72 68
65 51 75 68 75 66 77 61 64 74 (Points : 4)
38. Word Problem: Does the data set represent a sample or a population? If it is a sample, describe the population from which it has been drawn.
The following data represent scores of 50 students in an applied business statistics test.
72 72 93 70 59 78 74 65 73 80
57 67 72 57 83 76 74 56 68 67
74 76 79 72 61 72 73 76 67 49
71 53 67 65 100 83 69 61 72 68
65 51 75 68 75 66 77 61 64 74 (Points : 4)
39. Word Problems: The number of widgets produced by 9 employees in an eight hour shift is recorded as: 135, 120, 116, 119, 121, 125, 135, 131, 123
Find the mean number of widgets produced. (Points : 3)
40. Word Problems: The number of widgets produced by 9 employees in an eight hour shift is recorded as: 135, 120, 116, 119, 121, 125, 135, 131, 123
What is the range of widgets produced given in the problem presented above? (Points : 3)
41. Word Problems: The number of widgets produced by 9 employees in an eight hour shift is recorded as: 135, 120, 116, 119, 121, 125, 135, 131, 123
What is the mode of the number of widgets produced presented above? (Points : 3)
42. Word Problems: The number of widgets produced by 9 employees in an eight hour shift is recorded as: 135, 120, 116, 119, 121, 125, 135, 131, 123
What is the median of the number of widgets produced presented above? (Points : 3)
43. Critical Thinking: Two workers on the same job show the following results over a long period of time.
 Worker A  Worker B 
Mean time of completing the job (minutes)  30  25 
Standard deviation (minutes)  6  4 
Which worker appears to be more consistent in the time he requires to complete the job? Explain.
(Points : 5)
44. Critical Thinking: Two workers on the same job show the following results over a long period of time.
 Worker A  Worker B 
Mean time of completing the job (minutes)  30  25 
Standard deviation (minutes)  6  4 
Which worker appears to be faster in completing the job? Explain.
(Points : 5)
45. Critical Thinking: Explain the differences between longitudinal and cross sectional business research studies.
(Points : 10)
46. Critical Thinking: Suppose the manager of a plant is concerned with the total number of man hours lost due to accidents for the past 12 months. The company statistician has reported the mean number of man hours lost per month but did not keep a record of the total sum. Should the manager order the study repeated to obtain the desired information? Explain your answer clearly. (Points : 10)
47. Critical Thinking: Explain why histograms and frequency polygons are used in business statistics. (Points : 10)
48. Critical Thinking: Which two types of probability sampling are best suited for business research and statistical data analysis, and why? (Points : 10)
49. Critical Thinking: What is the difference between a null hypothesis and an alternate hypothesis? (Points : 10)
50. Critical Thinking: Explain what is meant by the critical value of a statistical value. (Points : 10)
51. Critical Thinking: What is the difference between a t test for independent means and a correlated t test? (Points : 10)
52. Critical Thinking: Explain the .05 confidence level. (Points : 10)
53. Critical Thinking: How is a research question similar to a research hypothesis? (Points : 10)
54. Critical Thinking: Describe each of the following statistical terms, and where applicable, define with the appropriate equation: Range, Variance, Standard Deviation (Points : 10)
55. Critical Thinking: Give a brief definition and an example of the following:
a. Descriptive Statistics
b. Inferential Statistics (Points : 10)
56. Critical Thinking: What does the correlation coefficient r describe? What about r squared? (Points : 10)
57. Critical Thinking: Describe some of the issues or concerns (at least three) which would be addressed in deciding how to perform a statistical test of a hypothesis: (Points : 15)
58. Critical Thinking: Discuss the implications of: magnitude (from 0 to 1); sign ( + or ); and probability versus causality for the Correlation Coefficient (also known as the Pearson Product Moment Correlation Coefficient). (Points : 15)
59. Critical Thinking: Describe how you would develop a random sample from among Argosy students (Points : 15)
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