Algebra 1 5-7 Guided Practice: Scatter Plots and Trend Lines
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by Matthew Richardson
| 11 Questions
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Solve It! The table shows the number of digital albums downloaded per year and the number of CDs sold by manufacturers per year. What relationship exists between the two sets of data?
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Solve It! Predict the number of CDs sold and the number of albums downloaded in 2010. Explain your reasoning.
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Problem 1 Got It? Make a scatter plot of the data in the table.
Be sure to include relevant graph detail: label axes, indicate units and scale on both axes, and use arrows to represent end behavior, as appropriate.
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Problem 1 Got It? What type of relationship does the scatter plot you created in the previous item show?
positive correlation
negative correlation
no correlation
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Problem 2 Got It? Make a scatter plot of the data in the table. Draw a trend line and write its equation.

Be sure to include relevant graph detail: label axes, indicate units and scale on both axes, and use arrows to represent end behavior, as appropriate.
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Problem 2 Got It? Use the trend line you drew in the previous item to predict the approximate body length of a 7-month-old panda.
About 24.4 in.
About 29.1 in.
About 34.2 in.
About 21.8 in.
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Problem 3 Got It? Use the equation of the line of best fit from Problem 3 to predict the cost of attending in the 2016-2017 academic year. You may use the embedded Desmos 4-function calculator above.

Include a dollar sign and round your answer to the nearest whole dollar.
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Problem 3 Got It? Reasoning: What does the slope of the line of best fit in Problem 3 tell you about the rate of change in the cost?
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Problem 4 Got It? In the following situation, is there likely to be a correlation? If so, does the correlation reflect a causal relationship? Explain.

the cost of a family's vacation and the size of their house
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Problem 4 Got It? In the following situation, is there likely to be a correlation? If so, does the correlation reflect a causal relationship? Explain.

the time spent exercising and the number of Calories burned
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