1. 1: Analyzing Categorical Data



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We now have a choice between two descriptions for center and spread:



  1. ________________________________________: Sensitive to extreme observations, and can be misleading when a distribution is skewed or has outliers. Use only for reasonably symmetric distributions that don’t have outliers.




  1. ________________________________________:

Resistant to extreme values, and thus the better choice. Usually better for describing a skewed distribution or a distribution with outliers.


    • NOTE: Numerical summaries do not fully describe the shape of a distribution. ALWAYS PLOT YOUR DATA!

EXAMPLE Who Texts More—Males or Females?

For their final project, a group of AP Statistics students wanted to compare the texting habits of males and females. They asked a random sample of students from their school to record the number of text messages sent and received over a two-day period. Here are their data:



Males: 127 44 28 83 0 6 78 6 5 213 73 20 214 28 11

Females: 112 203 102 54 379 305 179 24 127 65 41 27 298 6 130 0


    1. Determine if there are any outliers in either data set using the rule.



    1. Construct boxplots to compare the male and female data.




    1. Compare the distributions of text messages sent and received by males and females.

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