Main Idea/Vocabulary scatter plot line of fit Construct and interpret scatter plots.
Scatter Plots Below is a sample scatter plot, can you tell me what they are designed to show.
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Transcript of Scatter Plots Below is a sample scatter plot, can you tell me what they are designed to show.
Scatter PlotsBelow is a sample scatter plot, can you tell me what
they are designed to show.
ANSWER
• Scatter plots are most often used to show correlations or relationships among data.
Common Core #25-28
SCATTER PLOTS, VENN DIAGRAMS, TWO-WAY FREQUENCY TABLES
Scatter Plots Type #1
• POSITIVE
• STRONG or WEAK
As the number of hours that you study increases your overall class grade increases
Scatter Plots – Positive Correlation
Study Time Class Grade
0 55
0.5 61
1 67
1.5 73
2 81
2.5 89
3 91
3.5 93
4 95
4.5 97
How Study Time Affects Grades
0
20
40
60
80
100
120
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Time in hours
Ove
rall
grad
e
Make a prediction for a study time of 5 hours.
Scatter Plot Type #2
• NEGATIVE
• STRONG or WEAK
The age of a person and amount of time spent playing video games.
Scatter Plots – Negative Correlation
Make a prediction a 5 year old? 80 year old?
Scatter Plots #3
• NONE
There is no relationship between the number of shirts someone owns and their annual salary
Scatter Plots – No CorrelationHow does your wardrobe affect your
salary
0
20
40
60
80
0 10 20 30 40 50
Number of shirts owned
Sala
ry
Can you make a prediction based on this data?
Line of Best Fit & Outliers
• A line of best fit is a line that best represents the data on a scatter plot and often shows a trend in the data.
• Outliers are points too far away from the line of best fit.
NAME THAT SCATTER PLOTWEAK POSITIVE
NAME THAT SCATTER PLOTNONE
NAME THAT SCATTER PLOTSTRONG POSITIVE
NAME THAT SCATTER PLOTSTRONG NEGATIVE
Practice Problems
Pages 388-389
3-5, 11-12