## Description

**Math 302 Quiz 1 with Answers**

- What is the term for a characteristic or attribute that can assume different values?
- A pareto chart does NOT have which of the following properties?
- 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?
- 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?
- The amount of time needed to run the Boston marathon is an example of which type of variable?
- Gender and State are examples of which type of data?
- 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:
- Data that arise from counts are called:
- Researchers may gain insight into the characteristics of a population by examining a
- What type of graph is the figure below?
- Which of the following statements are false?
- For a boxplot, the box itself represents what percent of the observations?

Part 2 of 3

- 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

- 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.

- 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.
- 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
- 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.
- 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**

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