1. 1: Analyzing Categorical Data
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- two-way table
| bar graph or pie chart.
Pie charts should be used only when you want to emphasize each category’s relation to the whole. 
Bar graphs represent each category as a bar. The bar heights show the category counts or percents. Bar graphs are Easier to make than pie charts Easier to read More flexible than pie charts Tip: When you draw a bar graph, make the bars equally wide. Ex: Frequent superpower? An on-line survey asked which superpower high-school students would choose to have—fly, freeze time, invisibility, super strength, or telepathy. Here are the responses from the 40 randomly selected students in the sample: Fly Freeze time Telepathy Fly Telepathy Super strength Telepathy Telepathy Fly Super strength Invisibility Freeze time Fly Telepathy Freeze time Telepathy Super strength Fly Freeze time Telepathy Freeze time Freeze time Freeze time Fly Fly Fly Freeze time Invisibility Fly Invisibility Telepathy Telepathy Fly Telepathy Fly Fly Telepathy Telepathy Fly Fly Make an appropriate graph to display the distribution of superpower preference. Describe what you see. Ex: Social media The Pew Research Center surveyed a random sample of U.S. teens and adults about their use of social media in 2013. The pictograph on the right displays some results. 
Explain how this graph is misleading. Make a bar graph that displays the results in a non-misleading way. Would it be appropriate to display these results in a pie chart? Why or why not? Ex: Two possible bar graphs of the data are shown below. Which one could be considered deceptive? Why?  
Relationships Between Two or More Categorical Variables 
When a dataset involves two or more categorical variables, we begin by examining the counts or percents in various categories for one of the variables. A two-way table describes two categorical variables, organizing counts according to a row variable and a column variable. Ex: A survey of 4826 randomly selected young adults (aged 19 to 25) asked, “What do you think the chances are you will have much more than a middle-class income at age 30?” The table on the right shows the responses. The marginal distribution of one of the categorical variables in a two-way table of counts is the distribution of values of that variable among all individuals described by the table. Note: Percents are often more informative than counts, especially when comparing groups of different sizes. Directory: ourpages -> auto -> 2017 2017 -> Senior Division Solutions 2017 -> Avant garde adademy of broward 2017 -> Have you always wanted to go to space camp? Dreamt of becoming an astronaut here’s your chance! 2017 -> Atlanta, georgia-april 2017-a total solar eclipse occurs when the moon lines up between the earth and the sun-an extremely rare and beautiful event 2017 -> United states history and geography unit 1: The Rise of Industrial America 1877-1914 2017 -> Out-of-Field Notification to Parents/Guardians English 2017 -> Modern History Notes 9-21-2017 Entertainment 2017 -> The secret of change is to focus all of your energy, not on fighting the old, but on building the new 2017 -> The Berlin Conference 1884 Simulation Historical Context 2017 -> Island Biogeography and Biodiversity Part I: Background Reading Download 10.83 Mb. Share with your friends:
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