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Plotting Data Exploring Computer Science Lesson 5-7

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Objectives The student will be able to: Read and interpret a bar plot. Create bar plots. Differentiate between categorical and continuous data. Look for trends by analyzing various plots.

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Journal Entry If everyone were going to be put in a different group based on the MONTH in which they were born, how many groups would there be? Which group do you think would have the most people? Remember: Write down the questions Answer with complete thoughts and sentences

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Birthday Bar Plot

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Bar Charts The bar plot should be used for categorical data only. Categorical data is expressed in terms of specific category values or labels (e.g., days of the week, answers to a multiple choice survey). What would happen if we tried to do a bar plot of every student’s exact height (example of 68.901 inches),

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Public Agenda Data and Bar Plots Download the file SurveyRDA.csv file the web. This survey data file holds data collected by a private research group called Public Agenda (www.publicagenda.org). It is a survey of high school students and their parents and were identified by random selection from a list of all high school students in the United States. (www.publicagenda.org Respondents were asked over 100 questions—the file that will be used is a small subset.

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Public Agenda Data and Bar Plots How many different students are represented? How many different questions were asked of a student. What are the variables?

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Pivot Tables

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Public Agenda Bar Plot Activity 1.Create a bar plot for effort. Copy the plot to a document. How does the effort of the students that responded compare? 2.Create a bar plot for homework. Copy the plot to a document. How much homework did most students respond that they have? How do you think that compares with students at your school? If you think responses about homework are different from those at your school, why do you think students in this survey might have responded as they did? How could you test your assumption? 3.Create a bar plot for grades. Copy the plot to a document. What grade is most common? How do you think that compares with students at your school? If you think grades are different from those at your school, why do you think students in this survey might have responded as they did? How could you test your assumption?

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Public Agenda Bar Plot Activity 1. Create a Pivot table with effort as the row and grade as the column. Add this to your document 2. Create a bar plot with (effort, grades) Add this chart to your document What do you see in this plot?

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Plotting Your Data In your groups… Analyze the data you have collected with pivot tables and bar plots pulling in the additional contextual data sets as appropriate. What data are you going to need to analyze for your research question?

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