1. Warm Up #1 Round to the nearest tenth place.
34.64
7.0996
What is the difference between -52 and (-5)2?
If two basketball players have the same average (mean) points scored per game, does that mean they are equal in skill?

2. The 2 Basketball Players

3. 7.3 Find Measures of Central Tendency and Dispersion

4. Vocabulary
Statistics: numerical values used to summarize and compare sets of data
Measure of central tendency: number used to represent the center or middle set of data
Mean
Median
Mode

5. Vocabulary
Measure of Dispersion: statistic that tells you how spread out the values are
Range
Standard Deviation: “sigma”

6. EXAMPLE 1
Find measures of central tendency
Waiting Times
The data sets at the right give the waiting times (in minutes) of several people at two veterinary offices. Find the mean, median, and mode of each data set.

7. GUIDED PRACTICE
for Example 1
TRANSPORTATION 1.
The data set below gives the waiting times (in minutes) of 10 students waiting for a bus. Find the mean, median, and mode of the data set.
4, 8, 12, 15, 3, 2, 6, 9, 8, 7

8. EXAMPLE 2
Find ranges of data sets
Find the range of the waiting times in each data set. Explain what that means.
= 18

9. EXAMPLE 3
Standardized Test Practice

10. GUIDED PRACTICE
for Examples 2 and 3
Find the range and standard deviation of the data set.
4, 8, 12, 15, 3, 2, 6, 9, 8, 7

11. Homework
Pg. 261,