CHAPTER 1 Examining Distributions Copyright Macmillan Learning. Powered by Cognero. Page 1 Indicate the answer choice that best completes the statement or answers the question. 1. A stemplot of a set of data is roughly symmetric, but the data do not even approximately follow the 68-95-
99.7 rule. We conclude that the data are: a. Normal, but they are not standard Normal. b. standard Normal. c. not Normal. d. Normal. 2. The average salary of all female workers is $45,000. The average salary of all male workers is $51,000. What must be true about the average salary of all workers? a. It must be $48,000. b. It must be larger than the median salary. c. It could be any number between $45,000 and $51,000. d. It must be larger than $48,000. Each of the following two histograms represents the distribution of acceptance rates (percent accepted) among 25 business schools in 2005. The histograms use different class intervals but are based on the same data. In each class interval, the left endpoint is included but not the right. (The Practice of Statistics for Business and Economics, 5e Layth Alwan, Bruce Craig, George McCabe’s)
Test Bank, Answer at the end of each Chapter) Name: Class: Date: CHAPTER 1 Examining Distributions Copyright Macmillan Learning. Powered by Cognero. Page 2 3. Which interval contains fewer than half of all the observations? a. 20% ≤ acceptance rate < 35% b. 22.5% ≤ acceptance rate < 37.5% c. 25% ≤ acceptance rate < 40% d. 7.5% ≤ acceptance rate < 30% An investigation of wages paid to its employees by a large company was undertaken as a result of an allegation of discrimination. Data were collected for 1000 randomly selected employees. The data included employee ID, gender, race, annual wages in dollars (Salary), whether the employee had full-time status or part-time status (Full_Part), number of years of education (Ed), and number of years with the company (Tenure). The first two rows of data in the worksheet are displayed below. 4. How many variables does this data set contain? a. 2 b. 3 c. 6 d. 1000 5. For this density curve, which of the following is true? a. It is symmetric. b. The total area under the curve is 1. c. The median is 1. d. All of the above. A certain university's career services office took a survey of recent business school graduates to find out the general areas where graduates found jobs. Below is a bar graph of the results of the 300-person survey. In the Name: Class: Date: CHAPTER 1 Examining Distributions Copyright Macmillan Learning. Powered by Cognero. Page 3 bar graph, the bar for "Other" has been omitted. 6. The number of graduates who should be displayed in the "Other" class: a. is about 10. b. is about 20. c. is about 30. d. cannot be determined from the information given. Each of the following two histograms represents the distribution of acceptance rates (percent accepted) among 25 business schools in 2005. The histograms use different class intervals but are based on the same data. In each class interval, the left endpoint is included but not the right. Name: Class: Date: CHAPTER 1 Examining Distributions Copyright Macmillan Learning. Powered by Cognero. Page 4 7. What percent of the schools have an acceptance rate of less than 20%? a. 3% b. 4% c. 12% d. 16% 8. A sample was taken of the salaries of 20 employees of a large company. The following are the salaries (in thousands of dollars) for this year. For convenience, the data are ordered. 28 31 34 35 37 41 42 42 42 47 49 51 52 52 60 61 67 72 75 77 Suppose each employee in the company receives a $3000 raise for next year (each employee's salary is increased by $3000). The standard deviation of the salaries for the employees will: a. be unchanged. b. increase by $3000. c. be multiplied by $3000. d. increase by . 9. In comparing the two Normal distributions shown below, we can conclude that:
99.7 rule. We conclude that the data are: a. Normal, but they are not standard Normal. b. standard Normal. c. not Normal. d. Normal. 2. The average salary of all female workers is $45,000. The average salary of all male workers is $51,000. What must be true about the average salary of all workers? a. It must be $48,000. b. It must be larger than the median salary. c. It could be any number between $45,000 and $51,000. d. It must be larger than $48,000. Each of the following two histograms represents the distribution of acceptance rates (percent accepted) among 25 business schools in 2005. The histograms use different class intervals but are based on the same data. In each class interval, the left endpoint is included but not the right. (The Practice of Statistics for Business and Economics, 5e Layth Alwan, Bruce Craig, George McCabe’s)
Test Bank, Answer at the end of each Chapter) Name: Class: Date: CHAPTER 1 Examining Distributions Copyright Macmillan Learning. Powered by Cognero. Page 2 3. Which interval contains fewer than half of all the observations? a. 20% ≤ acceptance rate < 35% b. 22.5% ≤ acceptance rate < 37.5% c. 25% ≤ acceptance rate < 40% d. 7.5% ≤ acceptance rate < 30% An investigation of wages paid to its employees by a large company was undertaken as a result of an allegation of discrimination. Data were collected for 1000 randomly selected employees. The data included employee ID, gender, race, annual wages in dollars (Salary), whether the employee had full-time status or part-time status (Full_Part), number of years of education (Ed), and number of years with the company (Tenure). The first two rows of data in the worksheet are displayed below. 4. How many variables does this data set contain? a. 2 b. 3 c. 6 d. 1000 5. For this density curve, which of the following is true? a. It is symmetric. b. The total area under the curve is 1. c. The median is 1. d. All of the above. A certain university's career services office took a survey of recent business school graduates to find out the general areas where graduates found jobs. Below is a bar graph of the results of the 300-person survey. In the Name: Class: Date: CHAPTER 1 Examining Distributions Copyright Macmillan Learning. Powered by Cognero. Page 3 bar graph, the bar for "Other" has been omitted. 6. The number of graduates who should be displayed in the "Other" class: a. is about 10. b. is about 20. c. is about 30. d. cannot be determined from the information given. Each of the following two histograms represents the distribution of acceptance rates (percent accepted) among 25 business schools in 2005. The histograms use different class intervals but are based on the same data. In each class interval, the left endpoint is included but not the right. Name: Class: Date: CHAPTER 1 Examining Distributions Copyright Macmillan Learning. Powered by Cognero. Page 4 7. What percent of the schools have an acceptance rate of less than 20%? a. 3% b. 4% c. 12% d. 16% 8. A sample was taken of the salaries of 20 employees of a large company. The following are the salaries (in thousands of dollars) for this year. For convenience, the data are ordered. 28 31 34 35 37 41 42 42 42 47 49 51 52 52 60 61 67 72 75 77 Suppose each employee in the company receives a $3000 raise for next year (each employee's salary is increased by $3000). The standard deviation of the salaries for the employees will: a. be unchanged. b. increase by $3000. c. be multiplied by $3000. d. increase by . 9. In comparing the two Normal distributions shown below, we can conclude that:
