Education Technology

# Activities

• ##### Subject Area

• Math: Statistics: Data Analysis
• Math: Statistics: Describing Bivariate Data

9-12

40 Minutes

• ##### Device
• TI-Nspire™ CX/CX II
• TI-Nspire™ CX CAS/CX II CAS
• TI-Nspire™ Navigator™
• TI-Nspire™
• TI-Nspire™ CAS
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

3.2

## Transforming Relationships

#### Activity Overview

In this activity, students will assess the strength of a linear relationship using a residual plot. They will also calculate the correlation coefficient and coefficient of determination to assess the data set. Students will then learn to transform one or two variables in the relationship to create a linear relationship.

#### Key Steps

• Students are given a spreadsheet with four data sets. Each data set is graphed on a separate scatter plot.

• Students will transform a data set by calculating the logarithm value of the data, which linearizes the exponential data. They will assess the fit graphically and numerically.

• To assess the fit graphically and numerically, students will create a residual plot and look at the r and r2 values.