Transcript 1.2 Line Plots

Line Plots
• Mark each data point with an X
0, 2, 3, 3, 5, 5, 6, 6, 6, 9, 9
Making Line Plots
• Draw a line plot with the following data points:
85, 82, 80, 88, 83, 85, 87, 84, 89, 83
Making Line Plots
• Draw a line plot with the following data points:
85, 82, 80, 88, 83, 85, 87, 84, 89, 83
X
80
81
X
X
X
X
X
X
82
83
84
85
86
X
X
X
87
88
89
90
• Look at the range of data values before making your scale.
• Values range from 80 to 89 so a good scale is from 80 to 90.
Making Line Plots
• If there is a large range, you may need to use larger intervals
65, 80, 72, 67, 84, 70, 81, 70, 76, 77, 80
X
64
X
66
68
X
X
X
70
72
X
X X
X X
74
• Here the scale is in intervals of 2.
76
78
80
X
82
84
Minimum, Maximum, Range
• Minimum – least data point
• Maximum – greatest data point
• Range – maximum minus minimum
Minimum = _______
Maximum = _______
Range = _______
*Note: Do not just look at the scale to find the min and max.
Look at the X’s. The min and max above are not 0 and 10.
Minimum, Maximum, Range
• Minimum – least data point
• Maximum – greatest data point
• Range – maximum minus minimum
2
Minimum = _______
9
Maximum = _______
7
Range = _______
(9 – 2)
*Note: Do not just look at the scale to find the min and max.
Look at the X’s. The min and max above are not 0 and 10.
Median
• Median – middle data point
• Take turns crossing out the lowest and highest points. (Important:
You must cross out a low and high point together)
• OR list all the data points in order and find the middle number.
Median = _______
0, 2, 3, 3, 5, 5, 6, 6, 6, 9, 9
Median
• Median – middle data point
• Take turns crossing out the lowest and highest points. (Important:
You must cross out a low and high point together)
• OR list all the data points in order and find the middle number.
5
Median = _______
0, 2, 3, 3, 5, 5, 6, 6, 6, 9, 9
Median
• If there are 2 middle numbers, take the average of the 2
•Add the 2 middle numbers and divide by 2!
X
X
X
Median = _______
Median
• If there are 2 middle numbers, take the average of the 2
•Add the 2 middle numbers and divide by 2!
X
X
X
• The average of 5 and 6 is 5.5 ( 5 + 6 = 11
5.5
Median = _______
11 ÷ 2 = 5.5 )
Mode
• Mode – value that appears the most often
• The mode is the value with the most X’s
Mode = _______
Mode
• Mode – value that appears the most often
• The mode is the value with the most X’s
6
Mode = _______
Mode
• There may be more than 1 mode.
X
Mode = ___________
Mode
• There may be more than 1 mode.
X
3 and 6
Mode = ___________
Mode
• If no values appear more than once, there is NO MODE.
X
none
Mode = ___________