1. Picturing Distributions with Graphs BPS 7e Chapter 1 © 2014 W. H. Freeman and Company

2. Individuals and Variables Airport administrators take a sample of airline baggage and record the number of bags that weigh more than 75 pounds. What is the individual? a) number of bags weighing more than 75 pounds b) average weight of the bags c) each piece of baggage d) the airport administrators

3. Individuals and Variables (answer) Airport administrators take a sample of airline baggage and record the number of bags that weigh more than 75 pounds. What is the individual? a) number of bags weighing more than 75 pounds b) average weight of the bags c) each piece of baggage d) the airport administrators

4. Individuals and Variables In a study of commuting patterns of people in a large metropolitan area, respondents were asked to report the time they took to travel to their work on a specific day of the week. What is the individual? a) travel time b) a person c) day of the week d) city in which they lived

5. Individuals and Variables (answer) In a study of commuting patterns of people in a large metropolitan area, respondents were asked to report the time they took to travel to their work on a specific day of the week. What is the individual? a) travel time b) a person c) day of the week d) city in which they lived

6. Individuals vs. Variables In a study of commuting patterns of people in a large metropolitan area, respondents were asked to report the time they took to travel to their work on a specific day of the week. What is the variable of interest? a) travel time b) a person c) day of the week d) city in which they lived

7. Individuals vs. Variables (answer) In a study of commuting patterns of people in a large metropolitan area, respondents were asked to report the time they took to travel to their work on a specific day of the week. What is the variable of interest? a) travel time b) a person c) day of the week d) city in which they lived

8. Individuals and Variables Is the variable “monthly rainfall in Michigan” a categorical or quantitative variable? a) categorical b) quantitative

9. Individuals and Variables (answer) Is the variable “monthly rainfall in Michigan” a categorical or quantitative variable? a) categorical b) quantitative

10. Individuals and Variables If we asked people to report their “weight,” would that variable be considered a categorical or quantitative variable? a) categorical b) quantitative

11. Individuals and Variables (answer) If we asked people to report their “weight,” would that variable be considered a categorical or quantitative variable? a) categorical b) quantitative

12. Individuals and Variables We ask people whether their weight is underweight, normal, overweight, or obese. Is this variable categorical or quantitative? a) categorical b) quantitative

13. Individuals and Variables (answer) We ask people whether their weight is underweight, normal, overweight, or obese. Is this variable categorical or quantitative? a) categorical b) quantitative

14. Individuals and Variables a) 35 b) 200 c) 10,000 d) impossible to say A survey involving 35 questions was given to a sample of 200 students attending a university with an enrollment of 10,000. How many individuals do the data describe?

15. Individuals and Variables (answer) a) 35 b) 200 c) 10,000 d) impossible to say A survey involving 35 questions was given to a sample of 200 students attending a university with an enrollment of 10,000. How many individuals do the data describe?

16. Individuals and Variables a) 35 b) 200 c) 35 × 200 d) 35 × 10,000 A survey involving 35 questions was given to a sample of 200 students attending a university with an enrollment of 10,000. How many variables do the data contain?

17. Individuals and Variables (answer) a) 35 b) 200 c) 35 × 200 d) 35 × 10,000 A survey involving 35 questions was given to a sample of 200 students attending a university with an enrollment of 10,000. How many variables do the data contain?

18. Individuals and Variables What type of data is produced by the answer choices for this question? a) categorical b) quantitative How many times have you accessed the Internet this week? 1)never 2)once or twice 3)three or four times 4)more than four times

19. Individuals and Variables (answer) What type of data is produced by the answer choices for this question? a) categorical b) quantitative How many times have you accessed the Internet this week? 1)never 2)once or twice 3)three or four times 4)more than four times

20. Categorical Variables For data involving answers to the following question, what is the BEST method of displaying the data? a) bar graph b) boxplot c) histogram d) scatterplot How many times have you accessed the Internet this week? 1)never 2)once or twice 3)three or four times 4)more than four times

21. Categorical Variables (answer) For data involving answers to the following question, what is the BEST method of displaying the data? a) bar graph b) boxplot c) histogram d) scatterplot How many times have you accessed the Internet this week? 1)never 2)once or twice 3)three or four times 4)more than four times

22. Categorical Variables The purpose of pie charts and bar charts is to _______________. a) hide the data from the audience b) impress the audience with interesting colors and shapes c) help the audience grasp the distribution of the data quickly d) display the distribution of quantitative variables

23. Categorical Variables (answer) The purpose of pie charts and bar charts is to _______________. a) hide the data from the audience b) impress the audience with interesting colors and shapes c) help the audience grasp the distribution of the data quickly d) display the distribution of quantitative variables

24. Categorical Variables Married respondents in a survey were asked how they met their spouse. According to the bar chart below, how many respondents met their spouse through a dating service? a) 2 b) 20 c) 30 d) 70

25. Categorical Variables (answer) Married respondents in a survey were asked how they met their spouse. According to the bar chart below, how many respondents met their spouse through a dating service? a) 2 b) 20 c) 30 d) 70

26. Categorical Variables Bar graphs are more flexible than pie charts. Both graphs can display the distribution of a categorical variable, but a bar graph can also compare any set of quantities that are measured in the same units. a) True b) False

27. Categorical Variables (answer) Bar graphs are more flexible than pie charts. Both graphs can display the distribution of a categorical variable, but a bar graph can also compare any set of quantities that are measured in the same units. a) True b) False

28. Quantitative Variables Look at the following histogram of salaries of baseball players. What shape would you say the data take? a) bi-modal b) left-skewed c) right-skewed d) symmetric e) uniform

29. Quantitative Variables (answer) Look at the following histogram of salaries of baseball players. What shape would you say the data take? a) bi-modal b) left-skewed c) right-skewed d) symmetric e) uniform

30. Quantitative Variables Look at the following histogram of percent urban population in 50 U.S. states. What shape would you say the data take? a) bi-modal b) left-skewed c) right-skewed d) symmetric e) uniform

31. Quantitative Variables (answer) Look at the following histogram of percent urban population in 50 U.S. states. What shape would you say the data take? a) bi-modal b) left-skewed c) right-skewed d) symmetric e) uniform

32. Quantitative Variables Considering this histogram, about how many students in the survey paid more than $250 for textbooks? a) 29 b) 47 c) 52 d) 71

33. Quantitative Variables (answer) Considering this histogram, about how many students in the survey paid more than $250 for textbooks? a) 29 b) 47 c) 52 d) 71

34. Quantitative Variables What three features can best describe the overall pattern of a histogram? a) shape, center, skewness b) center, spread, outliers c) center, mean, symmetry d) shape, center, spread

35. Quantitative Variables (answer) What three features can best describe the overall pattern of a histogram? a) shape, center, skewness b) center, spread, outliers c) center, mean, symmetry d) shape, center, spread

36. Quantitative Variables In the dataset represented by the following stemplot, how many times does the number “28” occur? Leaf unit = 1.0. a) 0 b) 1 c) 3 d) 4 0 9 1246999 2111134567888999 3000112222345666699 4001445 50014 67 73

37. Quantitative Variables (answer) In the dataset represented by the following stemplot, how many times does the number “28” occur? Leaf unit = 1.0. a) 0 b) 1 c) 3 d) 4 0 9 1246999 2111134567888999 3000112222345666699 4001445 50014 67 73

38. Quantitative Variables What is an advantage of histograms over stemplots? a) They can be created by hand. b) The dataset can be any size. c) The actual data can be extracted from them. d) They can be horizontal or vertical.

39. Quantitative Variables (answer) What is an advantage of histograms over stemplots? a) They can be created by hand. b) The dataset can be any size. c) The actual data can be extracted from them. d) They can be horizontal or vertical.

40. Quantitative Variables What is an advantage of stemplots over histograms? a) They can use classes of any size. b) The dataset can be any size. c) The actual data can be extracted from them. d) They can be horizontal or vertical.

41. Quantitative Variables (answer) What is an advantage of stemplots over histograms? a) They can use classes of any size. b) The dataset can be any size. c) The actual data can be extracted from them. d) They can be horizontal or vertical.

42. Quantitative Variables Which of these plots is a time plot? a) Plot A b) Plot B c) both d) neither Plot A Plot B Year Net Generation of Electricity Residential Electricity Consumption

43. Quantitative Variables (answer) Which of these plots is a time plot? a) Plot A b) Plot B c) both d) neither Plot A Plot B Year Net Generation of Electricity Residential Electricity Consumption

44. Quantitative Variables What type of trend does the following time plot show? a) downward b) upward c) no trend

45. Quantitative Variables (answer) What type of trend does the following time plot show? a) downward b) upward c) no trend

46. Quantitative Variables What would be the correct interpretation of the following graph? a) There is an upward trend in the data. b) There is a downward trend in the data. c) The data show seasonal variation.

47. Quantitative Variables (answer) What would be the correct interpretation of the following graph? a) There is an upward trend in the data. b) There is a downward trend in the data. c) The data show seasonal variation.

48. Quantitative Variables An individual value that falls outside the overall pattern is called ____________. a) center b) shape c) outlier d) spread

49. Quantitative Variables (answer) An individual value that falls outside the overall pattern is called ____________. a) center b) shape c) outlier d) spread