# Data Distributions, Describing Variability and Comparing by Glenda Lappan, James T. Fey, William M. Fitzgerald, Susan N.

By Glenda Lappan, James T. Fey, William M. Fitzgerald, Susan N. Friel, Elizabeth Difanis Phillips

• Are soft-bound, 3-hole-punched to slot in scholars' binders
• 4-color with an interesting Unit Opener, Investigations, log on internet codes, ACE Homework, Mathematical Reflections, a Unit venture, in retrospect and searching forward, and a word list of phrases in English and Spanish
• Available in English and Spanish

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Additional resources for Data Distributions, Describing Variability and Comparing Groups

Sample text

23. H h. 5 seconds with a few gaps. 6 seconds with a number of gaps and no major clusters of times. 3 seconds, and have a few gaps including a possible outlier. Possible Answers to Mathematical Reflections 1. a. Frequencies (counts or percents) describe variability. There may be more of certain categories or numerical values while fewer of others. The range also is used with numerical data to describe variability. b. The range describes the difference between i. For the 11-year-old boys, about 73% of the maximum and minimum values in a distribution of numerical data.

There is a lot of reading in this problem. You may want to explore the first two problems together as a class to help students understand the issues that are being raised and to be able to think about choices that need to be made (Question B). If you do this, use Questions A and B from the Summarize so that you can complete the discussions of these two Questions. Have students work in pairs. 3 because many students have just a few animals, but the few students who have many animals increase the mean.

Austin just added them all up and got 513. Did anyone else do this? Do we agree on this total? So then you have to figure out how many sugar grams per serving for an average cereal. I just saw Austin divide by 70. Austin, why did you do that? Austin I was looking at all the numbers and I saw that there are 70 cereals. Pedro What do you mean they vary? Maria It goes from 1 through 15 sugars—some even have zero sugars. Raj Yeah. Teacher Yeah. Gwen said something earlier about 8–12 being a better number.