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Making a Line Plot Collect data and put in chronological order Determine a scale and intervals If you have a small range, you should probably use intervals.

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Presentation on theme: "Making a Line Plot Collect data and put in chronological order Determine a scale and intervals If you have a small range, you should probably use intervals."— Presentation transcript:

1 Making a Line Plot Collect data and put in chronological order Determine a scale and intervals If you have a small range, you should probably use intervals of 1 With larger scales, it is best to mark intervals every 2, 5, or 10 numbers. Ex. Scores on a math test Use a scale from 60 to 100 and intervals of 5 Ex. Scores on a math test 63 68 72 74 79 80 80 83 84 84 84 85 88 90 90 90 90 93 95 95 95 97

2 Making a Line Plot Draw a horizontal line and mark the intervals Ex. Scores on a math test 63 68 72 74 79 80 80 83 84 84 84 85 88 90 90 90 90 93 95 95 95 97 60 65 70 75 80 85 90 95 100

3 Making a Line Plot Mark an X above the number for each data point If a number is repeated, place one X above the other Ex. Scores on a math test 63 68 72 74 79 80 80 83 84 84 84 85 88 90 90 90 90 93 95 95 95 97 60 65 70 75 80 85 90 95 100 X XX X XX X X X X X X XX X X X XX X X

4 Making a Line Plot Count the number of data points and count the number of Xs to make sure you plotted each point! Ex. Scores on a math test 63 68 72 74 79 80 80 83 84 84 84 85 88 90 90 90 90 93 95 95 95 97 60 65 70 75 80 85 90 95 100 X XX X XX X X X X X X XX X X X XX X X 22 data points 22 Xs

5 Reading a Line Plot Understand the scale and interval Ex. This line plot has intervals of 2, so an X that falls between numbers would represent the median of those numbers. An X between the 6 and 8 would represent 7 0 2 4 6 8 10 12 14 16 XXX X XX X X X X X XX

6 Reading a Line Plot Finding the Minimum Minimum – smallest value 0 2 4 6 8 10 12 14 16 XXX X XX X X X X X XX The minimum is the number represented by the first X 1 Do NOT just look at the numbers on the scale. The Minimum is NOT 0 The MINIMUM is 1

7 Reading a Line Plot Finding the Maximum Maximum – greatest value 0 2 4 6 8 10 12 14 16 XXX X XX X X X X X XX The maximum is the number represented by the last X 15 Do NOT just look at the numbers on the scale. The Maximum is NOT 16 The MAXIMUM is 15

8 Reading a Line Plot Finding the Range Range – difference between highest value and lowest value 0 2 4 6 8 10 12 14 16 XXX X XX X X X X X XX Subtract the number represented by the first X from the number represented by the last X 15 1 -= 14 Do NOT just look at the numbers on the scale. The Range is NOT 16 – 0 = 16 The RANGE is 14

9 Reading a Line Plot Finding the Median Median – middle number when data is arranged in chronological order 0 2 4 6 8 10 12 14 16 XXX X XX X X X X X XX Cross off the first and last X. Continue crossing off the first and last Xs until you reach the middle. The MEDIAN is 8

10 Reading a Line Plot Finding the Median Median – middle number when data is arranged in chronological order 0 2 4 6 8 10 12 14 16 XXX X XXXX X X XX If there are 2 numbers left in the middle, the median is the middle of those 2 numbers. The 2 middle numbers are 7 and 8, so the median is 7.5

11 Reading a Line Plot Finding the Median Median – middle number when data is arranged in chronological order 0 2 4 6 8 10 12 14 16 XXX X XX X X X X X XX If you get confused crossing off the Xs, list the numbers represented by the Xs in chronological order and cross them off. 1 2 4 4 7 8 8 8 10 10 10 11 15

12 Reading a Line Plot Finding the Mean Mean – average 0 2 4 6 8 10 12 14 16 XXX X XX X X X X X XX Add all the data points and divide by the total number of data points Remember to include ALL the Xs 1 Continue for all data points 2 4 4 7 + + + + + 8 + 8 + 8 + 10 + 10 + 10 + 11 + 15 Add Them Up! 98 Divide by the # of Xs 13 Xs so divide by 13 ÷ 13 7.538 Round if you get a long decimal 7.5 The MEAN is 7.5


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