Description

Math 302 Quiz 1 with Answers

1. What is the term for a characteristic or attribute that can assume different values?
2. A pareto chart does NOT have which of the following properties?
3. Suppose that a histogram of a data set is approximately symmetric and “bell shaped”. Approximately what percent of the observations are within two standard deviations of the mean?
4. Suppose that a histogram of a data set is approximately symmetric and “bell shaped”. Approximately, what percent of the observations are within three standard deviations of the mean?
5. The amount of time needed to run the Boston marathon is an example of which type of variable?
6. Gender and State are examples of which type of data?
7. The average score for a class of 30 students was 75. The 20 male students in the class averaged 70. The 10 female students in the class averaged:
8. Data that arise from counts are called:
9. Researchers may gain insight into the characteristics of a population by examining a
10. What type of graph is the figure below?
11. Which of the following statements are false?
12. For a boxplot, the box itself represents what percent of the observations?

Part 2 of 3

13. The following data are the base salaries, in thousands of dollars, of 50 chief executive officers for a sample of companies doing business with the state of Connecticut. That is, the first entry in the table below corresponds to a salary of $125,000. A copy of this data set can be found in the Excel Workbook called CEOSalaries.xls. Find the mean of the CEO salaries, in thousands of dollars, rounded to 2 decimal places. Do not use a dollar sign. Note: $177,760 should be recorded as 177.76. Correct172.34

14. The histogram below represents scores achieved by 250 job applicants on a personality profile. How many job applicants scored between 10 and 30? Place your answer in the blank. Do not use any stray symbols.  For example, 123 would be a legitimate answer.

17. A statistics professor has just given a final examination in his statistical inference course. He is particularly interested in learning how his class of 40 students performed on this exam. The scores are shown below.
18. The following data represent the number of children in a sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2. Compute the mean number of children. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry. Correct1.50
19. A statistics professor has just given a final examination in his statistical inference course. He is particularly interested in learning how his class of 40 students performed on this exam. The scores are shown below.
20. The following data are the base salaries, in thousands of dollars, of 50 chief executive officers for a sample of companies doing business with the state of Connecticut. That is, the first entry in the table below corresponds to a salary of $125,000. A copy of this data set can be found in the Excel Workbook called CEOSalaries.xls. Find the standard deviation of the CEO salaries, in thousands of dollars, rounded to 2 decimal places. Do not use a dollar sign. Note: $177,760 should be recorded as 177.76. Correct43.94

Part 3 of 3

19. Phone numbers, Social Security numbers, and zip codes are examples of numerical variables
20. The value of the standard deviation always exceeds that of the variance.