Vocabulary  Stem-and-leaf-plot  Leaf  Stem  Histogram

2.8 Displaying Data Integ. Math

Stem-and-Leaf  Is a table of data what is it used for? points out were the average lies without a lot of calculations. Shows you how spread out the data is, or vise versa.

Construct  For an article being prepared for a health magazine cholesterol levels of twenty women were measured: 185, 234, 208, 197, 259, 177, 192, 188, 208, 200, 215, 199, 209, 234, 208, 146, 216, 201, 232, 186.  Construct your plot  Identify any outliers, clusters, and gaps in the data.  Find the median  Find the mean

Construct  On an aptitude test measuring reasoning ability on a scale of 0 to 100, a class of 30 students received the following test scores: 38, 75, 28, 34, 56, 32, 61, 28, 71, 27, 62, 50, 66, 40, 38, 71, 60, 52, 33, 59, 74, 69, 86, 57, 65, 16, 60, 56, 55, 38.  Construct your plot  Identify any outliers, clusters, and gaps in the data.  Find the median  Find the mean

Frequency Distributions  Another table What is it used for? Set up a histogram Shows how often each number occurs in your data. Would be an easy way of determining most occurring and least occurring.

Construct  The town Gazette surveyed 40 families, and asked them to record the number of hours per week their television was in use. Please list the following in a frequency table. Then construct a histogram to display the data. 2, 5, 9, 10, 12, 12, 13, 14, 18, 20, 20, 20, 24, 24, 24, 23, 25, 26, 25, 21, 23, 31, 31, 34, 35, 35, 36, 38, 40, 41, 43, 43, 45, 46, 46, 51, 52, 52, 53

Construct  A class earned the following scores on a science quiz: 89, 88, 72, 66, 89, 90, 94, 75, 95, 82, 84. Make a frequency table and a histogram of the data.

Homework  Pg #8-34 evens