Grade 9 Scatter Plot Word Problems
A worksheet for Grade 9 students to practice solving word problems involving scatter plots, interpreting correlations, and making predictions.
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Grade 9 Scatter Plot Word Problems
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Read each word problem carefully. For questions involving scatter plots, plot the data, describe the correlation, and answer the questions based on your analysis. Show all your work.
1. A researcher collected data on the number of hours students spent studying for a math test and their corresponding test scores. The data is shown below:
Hours Studied (x): 2, 3, 4, 5, 6, 7 Test Score (y): 65, 70, 75, 80, 85, 90
a) Create a scatter plot for the given data on the graph below.
b) Describe the type of correlation shown in the scatter plot.
c) If a student studied for 8 hours, what would you predict their test score to be based on the trend?
2. Which of the following scatter plots would most likely show a negative correlation?
Hours spent exercising vs. overall fitness level
Temperature vs. number of ice cream sales
Number of hours watching TV vs. test scores
Age of a car vs. its value
3. If a scatter plot shows points that are widely spread out with no clear pattern, it indicates a correlation.
4. A line of best fit helps to show the or trend in a scatter plot.
5. Explain the difference between interpolation and extrapolation when making predictions from a scatter plot.
6. A strong positive correlation means that as one variable increases, the other variable tends to decrease.
True
False