Grade 8 Scatter Plot Word Problems
This worksheet helps 8th-grade students practice interpreting and creating scatter plots from word problems, identifying associations, and drawing lines of best fit.
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Scatter Plot Word Problems
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Read each word problem carefully. For each problem, create a scatter plot, describe the association, and draw a line of best fit if appropriate. Answer all questions.
1. An ice cream vendor tracked the daily temperature and the number of ice cream cones sold. The data is shown below:
Temperature (°F): 68, 70, 72, 75, 78, 80, 82, 85
Cones Sold: 120, 125, 130, 135, 140, 145, 150, 155
a) Create a scatter plot for this data.
b) Describe the association between temperature and ice cream cones sold (positive, negative, or no association).
c) Draw a line of best fit on your scatter plot.
d) Predict the number of cones sold if the temperature is 73°F.
2. A teacher recorded the number of hours students studied for a math test and their scores. The data is as follows:
Hours Studied: 1, 2, 3, 4, 5, 6, 7, 8
Test Score: 60, 65, 70, 75, 80, 85, 90, 95
a) Create a scatter plot for this data.
b) Describe the association between hours studied and test scores.
c) Draw a line of best fit on your scatter plot.
d) If a student studied for 4.5 hours, what would you predict their test score to be?
3. A scatter plot showing the number of hours spent watching TV and a student's grades would likely show a positive association.
True
False
4. Which of the following describes a negative association in a scatter plot?
As one variable increases, the other variable also increases.
As one variable increases, the other variable decreases.
There is no clear relationship between the variables.
The data points form a straight horizontal line.
5. A line of best fit is also known as a .
6. When data points on a scatter plot are spread out randomly, it indicates association.
7. Explain why a scatter plot is a useful tool for analyzing relationships between two variables.