MATH 302 Quiz 1 - Question and Answers

MATH 302 Quiz 1 Part 1 of 3 1. A histogram that is positively skewed is also called 2. Researchers may gain insight into the characteristics of a population by examining a 3. A variable is classified as ordinal if: 4. A sample of 20 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is: 5. A pareto chart does NOT have which of the following properties? 6. What type of graph is the figure below? 7. Numerical variables can be subdivided into which two types? 8. 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: 9. Gender and State are examples of which type of data? 10. Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10? 11. Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12? 12. 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? Part 2 of 3 13. 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. 14. 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. 15. The histogram below represents scores achieved by 250 job applicants on a personality profile. Seventy percent of the job applicants scored above what value? Place your answer in the blank. Do not use any stray symbols. For example, 123 would be a legitimate answer. 16. 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. 1.90 17. 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. 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 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 Part 3 of 3 19. Suppose that a sample of 10 observations has a standard deviation of 3, then the sum of the squared deviations from the sample mean is 30. 20. The number of car insurance policy holders is an example of a discrete random variable