Data Analysis Measures of Central Tendency Objective To

Data Analysis: Measures of Central Tendency Objective: To find and interpret the mean, median, and mode of a set of data. Open books to page 711.

(1. ) Measures of Central Tendency ** Definition: Measures of central tendency are used to describe sets of data because they represent a centralized or middle value. NOTE: Mean, Median, and Mode are all measures of central tendency.

(2. ) Mean ** Definition: The sum of a set of numbers divided by the number of numbers in the set. Example: Set = { 5, 8, 10, 12, 15 } Mean = (5 + 8 + 10 + 12 + 15) / 5 = 10

(2. ) Median ** Definition: The median of a set of data is the middle number of the set, when the numbers are arranged in numerical order. Example: { 5, 8, 10, 12, 15 } { 2, 5, 7, 8 } Median = 10 Median = (5+7)/2 = 6 NOTE: If there an even number of numbers in a set, then the median is the average of the two

(3. ) Mode and (4. ) Frequency ** Mode: The mode of a set of data is the number with the highest frequency (the number that appears the most) NOTE: There can be more than one mode. Frequency: The number of times a number occurs. NOTE: The frequency of a set of data is the number of elements (numbers) in the set.

Using the TI 83/84 * To find the mean and median of a set of data: 1. Enter the data into L 1 ([stat][edit] L 1) 2. Find the stats ([stat][calc] One. Var. Stats [Enter]) 3. Find the mean and median of : 1, 3, 4, 8, 14, 20

Homework Page 712, #1 – 14 (ALL) Due tomorrow