Data Analysis Supporting Idea.

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Presentation transcript:

Data Analysis Supporting Idea

The Measures of Central Tendency

Find the Mean Divide by the number of entries in the data set Add up all of the values in the data set Check your sum Divide by the number of entries in the data set

Find the Mean 8

Find the Median LINE UP all the values from least to greatest Be sure to include duplicates Count pairs from each outside edge until you reach the center

Find the Median When the number of items in the data set is odd, there is always a middle 5, 7, 9, 9, 12, 24, 27, 31, 32 12 is the middle 5, 7, 9, 9, 13, 24, 27, 31, 32, 33 5, 7, 9, 9, 12, 24, 27, 31, 32, 33 12+ 24 2 When the number of items in the data set is even, find the mean of the center two values! 36÷ 2 = 18; 18 is the middle

Find the Median 3

Find the Mode LINE UP all the values from least to greatest Count the number of occurrences of each number The mode is the value that appears most often

There could be MULTIPLE Modes Find the Mode There can be NO Mode 5, 7, 9, 10, 12, 24, 27, 31, 32 Each number appears only once! There is no mode. There could be ONE Mode 5, 7, 9, 10, 12, 24, 27, 27, 32 The number 27 appears twice! It is the mode. The numbers 9 and 27 appear twice! They are both modes. 5, 7, 9, 9, 12, 24, 27, 27, 32 There could be MULTIPLE Modes

Find the mode of the test grades shown below: 85 & 100

Greatest minus least = range Find the Range Think of the golf range! How far will the ball go? How far does the data spread? Greatest minus least = range

Find the Range 35

Mixed Problem Solving H

Mixed Problem Solving B

Mixed Problem Solving I

Mixed Problem Solving B

Mixed Problem Solving 85

Mixed Problem Solving H

Mixed Problem Solving 2

Mixed Problem Solving D

Mixed Problem Solving H

Mixed Problem Solving 29

Mixed Problem Solving D

Mixed Problem Solving 39

Data Analysis Supporting Idea Keep Practicing!