SECTION 1-7: ANALYZING AND DISPLAYING DATA Goal: Use statistical measures and data displays to represent data.

Measures of Central Tendency  Mean – average, of n numbers the mean is the sum of the numbers divided by n  Median – middle, of n numbers the median is the middle number when the numbers are written on order. If n is even, the median is the mean of the two middle numbers.  Mode – most frequent, of n numbers the mode is the number or numbers that occurs most frequently. There may be one mode, no modes, or more than one mode.

Example 1: Find the Measures of Central Tendency  Find the mean, median and mode(s) of the 30 team scores

Range – difference between the greatest and least data values. Measures of Dispersion

Example 2: Find the Ranges of Data Sets  Find the range of the Eastern and Western Conferences.  Range of Eastern Conference:  Range of Western Conference:

Box and Whisker Plots  Lower quartile – is the median of the lower half.  Upper quartile – is the median of the upper half.

Example 3: Find the Lower and Upper Quartiles a. 10, 15, 17, 18, 20, 21b. 31, 33, 33, 35, 36, 39, 40, 41, 41

Checkpoint: Find the Range, Median, and Lower and Upper Quartile  Find the range, median, lower quartile, and upper quartile for each set of data. a. 11, 15, 16, 16, 17, 20, 24, 24, 24, 27, 29 b. 47, 50, 51, 55, 55, 55, 57, 63, 66, 68, 68, 75

Drawing a Box and Whisker Plot

Example 4: Draw a Box and Whisker Plot  Draw a box and whisker plot of the Eastern Conference Data

Checkpoint: Draw a Box and Whisker Plot  Draw a box and whisker plot of the Western Conference Data

p even, Homework: