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Picturing Distributions with Graphs BPS chapter 1 © 2006 W.H. Freeman and Company.

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Presentation on theme: "Picturing Distributions with Graphs BPS chapter 1 © 2006 W.H. Freeman and Company."— Presentation transcript:

1 Picturing Distributions with Graphs BPS chapter 1 © 2006 W.H. Freeman and Company

2 Individuals vs. 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 vs. 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 vs. variables Airport administrators take a sample of airline baggage and record the number of bags that weigh more than 75 pounds. What is the variable of interest? a) Number of bags weighing more than 75 pounds. b) Average weight of the bags. c) Each piece of baggage. d) The airport administrators.

5 Individuals vs. 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 variable of interest? a) Number of bags weighing more than 75 pounds. b) Average weight of the bags. c) Each piece of baggage. d) The airport administrators.

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 individual? 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 individual? a) Travel time. b) A person. c) Day of the week. d) City in which they lived.

8 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.

9 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.

10 Categorical vs. quantitative variables Would the variable monthly rainfall in Michigan be considered a categorical or quantitative variable? a) categorical b) quantitative

11 Categorical vs. quantitative variables (answer) Would the variable monthly rainfall in Michigan be considered a categorical or quantitative variable? a) categorical b) quantitative

12 Categorical vs. quantitative variables If we asked people to report their weight, would that variable be considered a categorical or quantitative variable? a) categorical b) quantitative

13 Categorical vs. quantitative variables (answer) If we asked people to report their weight, would that variable be considered a categorical or quantitative variable? a) categorical b) quantitative

14 Categorical vs. quantitative variables We then asked people to classify their weight as underweight, normal, overweight, or obese. Would this variable now be categorical or quantitative variable? a) categorical b) quantitative

15 Categorical vs. quantitative variables (answer) We then asked people to classify their weight as underweight, normal, overweight, or obese. Would this variable now be categorical or quantitative variable? a) categorical b) quantitative

16 Categorical vs. quantitative 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)None 2)Once or twice 3)Three or four times 4)More than four times

17 Categorical vs. quantitative 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)None 2)Once or twice 3)Three or four times 4)More than four times

18 Graphing For the Internet access data in the previous question, what is the BEST method of displaying the data? a) bar graph b) boxplot c) histogram d) scatterplot

19 Graphing (answer) For the Internet access data in the previous question, what is the BEST method of displaying the data? a) bar graph b) boxplot c) histogram d) scatterplot

20 Stemplots 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)

21 Stemplots (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)

22 Histograms Look at the following histogram. How many baseball players report a salary of less than $1,441,000? a) 50 b) 170 c) 220 d) 350

23 Histograms (answer) Look at the following histogram. How many baseball players report a salary of less than $1,441,000? a) 50 b) 170 c) 220 d) 350

24 Histograms Look at the following histogram for 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

25 Histograms (answer) Look at the following histogram for 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

26 Time plots Which of these plots is a time plot? a) Plot A b) Plot B c) both d) neither

27 Time plots (answer) Which of these plots is a time plot? a) Plot A b) Plot B c) both d) neither

28 Time plots What type of trend does the following time plot show? a) Downward b) Upward c) No trend

29 Time plots (answer) What type of trend does the following time plot show? a) Downward b) Upward c) No trend

30 Time plots What would be the correct interpretation of the following graph? a) There is an upward trend in the data. b) There is no trend in the data. c) There is a downward trend in the data. d) The data show an existence of seasonal variation.

31 Time plots (answer) What would be the correct interpretation of the following graph? a) There is an upward trend in the data. b) There is no trend in the data. c) There is a downward trend in the data. d) The data show an existence of seasonal variation.


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