By Barbara Illowsky, Susan Dean

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**Extra resources for Collaborative Statistics**

**Sample text**

In this chapter, we will briefly look at stem-and-leaf plots, line graphs and bar graphs. Our emphasis will be on histograms and boxplots. It is a good choice when the data sets are small. To create the plot, divide each observation of data into a stem and a leaf. The leaf consists of a final significant digit. For example, 23 has stem 2 and leaf 3. Four hundred thirty-two (432) has stem 43 and leaf 2. Five thousand four hundred thirty-two (5,432) has stem 543 and leaf 2. 3 has stem 9 and leaf 3.

40> 47 a. List some practical difficulties involved in getting accurate results from a telephone survey. b. List some practical difficulties involved in getting accurate results from a mailed survey. c. With your classmates, brainstorm some ways to overcome these problems if you needed to conduct a phone or mail survey. 1 Try these multiple choice questions The next four questions refer to the following: A Lake Tahoe Community College instructor is interested in the mean number of days Lake Tahoe Community College math students are absent from class during a quarter.

3 (Solution on p. ) Sixty adults with gum disease were asked the number of times per week they used to floss before their diagnoses. 4500 1 18 3 12 This Cumulative Relative Freq. 19/>. 23 a. Fill in the blanks in the table above. b. What percent of adults flossed six times per week? c. What percent flossed at most three times per week? 4 A fitness center is interested in the mean amount of time a client exercises in the center each week. Define the following in terms of the study. Give examples where appropriate.

### Collaborative Statistics by Barbara Illowsky, Susan Dean

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