MATH 302 Quiz 1 Set 1

MATH 302 Quiz 1 1. An advertisement for a car states that it is 10% more powerful than its competitor. This is an example of 2. A scatterplot allows one to see: 3. Which of the following are the two most commonly used measures of variability? 4. A histogram that has a single peak and looks approximately the same to the left and right of the peak is called: 5. What kind of relationship between x and y is demonstrated by the scatter plot below? 6. Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10? 7. Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12? 8. Researchers may gain insight into the characteristics of a population by examining a  9. 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? 10. What is the term for a characteristic or attribute that can assume different values? 11. Which measure of central location is meaningful when the data are categorical? 12. Which of the following are the three most common measures of central location? 13. Click to see additional instructions. 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 median number of children. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry.  1.50   14. 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 variance of the data. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry.  2.77   15. 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 CEOS. Find the median 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.  165  16. A sample of 150 students at a State University was taken after the final business statistics exam to ask them whether they went partying the weekend before the final or spent the weekend studying, and whether they did well or poorly on the final. The following table contains the result. 17. The histogram below represents scores achieved by 250 job applicants on a personality profile. Sixty percent of the job applicants scored below what value?  Place your answer in the blank. Do not use any stray symbols. For example, 123 would be a legitimate answer. 18. 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 CEOS.  19. The number of car insurance policy holders is an example of a discrete random variable 20. Individual observations within each category may be found in a frequency table.