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Line of best fit algebra 1

04/12/2021 Client: muhammad11 Deadline: 2 Day

Algebra HELP - Word Problem#2 - Scatter Plots And Lines Of Best Fit

There are many measurements of the human body that are positively correlated. For example, the length of one's forearm (measured from elbow to wrist) is approximately the same length as the foot (measured from heel to toe). They are positively correlated because, as one measurement increases, so does the other measurement.

You will discover through this project whether a human's arm span (measured across the body with the arms extended) is correlated to his height.

You will need to collect data from 11 people, which will give you 12 data points including your own personal data. You will turn in and answer questions regarding only one scatter plot if doing the project alone.

Part One: Measurements

1. Measure your own height and arm span (from finger-tip to finger-tip) in inches. You will likely need some help from a parent, guardian, or sibling to get accurate measurements. Record your measurements on the "Data Record" document. Use the "Data Record" to help you complete Part Two of this project.

2. Measure 11 additional people, and record their arm spans and heights in inches.

Part Two: Representation of Data with Plots

1. Using graphing software of your choice, create a scatter plot of your data. Predict the line of best fit, and sketch it on your graph.

2. Copy and paste your scatter plot into a word processing document.

Part Three: The Line of Best Fit

Include your scatter plot and the answers to the following questions in your word processing document.

1. Which variable did you plot on the x-axis, and which variable did you plot on the y-axis? Explain why you assigned the variables in that way.

2. Write the equation of the line of best fit using the slope-intercept formula $y = mx + b$. Show all your work, including the points used to determine the slope and how the equation was determined.

3. What does the slope of the line represent within the context of your graph? What does the y-intercept represent?

4. Test the residuals of two other points to determine how well the line of best fit models the data.

5. Use the line of best fit to help you to describe the data correlation.

6. Using the line of best fit that you found in Part Three, Question 2, approximate how tall is a person whose arm span is 66 inches?

7. According to your line of best fit, what is the arm span of a 74-inch-tall person?

06.06 Scatter Plots and Line of Best Fit

RequirementsPossible PointsStudent PointsStudent creates a scatter plot correctly according to submitted data.3

Student shows that the line of best fit goes through the center of the data.2 Student answers Question 1 correctly by determining which variable should be on which axis.2 Student answers Question 2 correctly, presenting a reasonable equation for the line of best fit given the data.3 Student answers Questions 3 through 7 correctly based on the data provided (2 points each).10

Sheet1
Data Record
Copy and paste the information below into a word processing document. Complete the table, and include it in your work file for assessment "06_06 Scatter Plots and Line of Best Fit."
Name Relationship to Student Arm Span in Inches Height in Inches
Marisa Student 62 67
Tony Father 76 74
Paula Mother 64 62
Dominic Brother 73 68

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