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Assignment Stats 250 W11 HW 1 Graded Point Total: 26 out of 30 a. 1 out of 2 points Feedback: You only give one categorical variable, "Grade", where the categories are "Freshman", "Sophomore", etc. Describe two categorical variables that you might measure for each student in your study. Your Answer: You could separate them into the categories: Freshman and Sophomore, Junior and Senior. This would compare the differences between the two groups of grades and see how they differ in their Facebook habits. Solution: <ol><li>Sex (Male, Female)</li><li>College year of study (Freshmen, Sophomore, Junior, Senior) </li></ol> b. 2 out of 2 points Describe two quantitative variables (include your units) that you might measure for each student in your study. Your Answer: Average Number of Hours on Facebook Per Day (Hours), Number of Friends (Hundreds of People) This would be the number of hours per day the student is on Facebook, if the study is over a few days, it would be the total number of hours on Facebook divided by the number of days of the study. Solution: <ol><li>Time spent actively on Facebook (in hours per day) </li><li>Number of current friends on Facebook </li></ol> Required Assignment Stats 250 W11 HW 1 Question 1 (Chapter 2) You are preparing to study the Facebook™ habits of college students. 4/17/2011 www.lecturebook.com/homeworks/sho… lecturebook.com/homeworks/show/33 1/12
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c. 0 out of 1 points Feedback: A bar chart is used to show the distribution of a categorical variable. It is not used as you describe. If you wish to compare the two variables you suggest, use a side-by-side boxplot, and don't lose information by turning your quantitative variable into a categorical one. Describe one graph that you might wish to create to look at your collected data in an appropriate way. Your Answer: Bar Chart of Category of Student (Freshman/Sophomore or Junior/Senior) and Hours on Facebook Per Day (Hours) X Axis would have the Category of Student (Freshman/Sophomore or Junior/Senior) Y Axis would have the Hours on Facebook would be split into: Less than 1, 1-2, 2-3, 3-4, 5+ (Hours). Solution: Histogram (according to sex or year of study category) to examine the distribution of the time spent actively on Facebook. d. 0 out of 1 points Feedback: This is not a bar chart. Bar charts show the distribution of a categorical variable. Describe another graph that you might wish to create to look at your collected data in an appropriate way. Your Answer: Bar Chart of Category of Student (Freshman/Sophomore or Junior/Senior) and Number of Friends (Hundreds of People) X Axis would have the Category of Student (Freshman/Sophomore or Junior/Senior) Y Axis would have the Number of Friends (Hundreds of People) This would probably be 1-100, 101-200, 201-300, 301-400, 401-500, 501+ people. Solution:
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