11-6: TEKS Practice

  • 1. Think About the Process The scatter plot shows data that suggest a linear association.

    A scatter plot. Points: 15 plotted from 1 to 15 on the x-axis and from 3 to 15 on the y-axis with a negative linear association.

    • a. Find an equation for the trend line using the points (3, 29) and (13, 15).

      • A. y=33.2x−1.4

      • B. y=−1.4x+33.2

      • C. y=−0.6x+29.2

      • D. y=−1.4x+33.7

    • b. How can you decide which points are the outliers?

    • c. Find the outliers.

    • d. Remove the outliers. Find a trend line for the adjusted data using the points (2, 28) and (12, 22).

    • e. How do the outliers affect the position of the trend line?

  • 2. The scatter plot shows data for the circumference and height of a variety of tree. The plot suggests a linear association. The summary points are (50, 30), (125, 37), and (200, 99).

    A scatter plot: Tree Heights x-axis: Circumference (in.). y-axis: Height (ft). Points: 9 plotted from 26 to 226 on the x-axis and from 17 to 106 on the y-axis with a positive linear association.

    • a. Find the median-median trend line.

      • A. A: A trend line through (0, 25) and (250, 105).

      • B. B: A trend line through (100, 45) and (200, 90).

      • C. C: A trend line through (25, 30) and (125, 75).

    • b. Estimate the height of a tree that has circumference 80 in.


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Table of Contents

Digits, Grade 8, Volume 2, Homework Helper Unit D: Two-Dimensional Shapes Unit E: Measurement and Data Unit F: Personal Financial Literacy Unit G: Step-Up Lessons English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties