## Reflection: Developing a Conceptual Understanding Creating a Residual Plot - Section 4: Closure

This entire lesson basically focused on two measures to determine the strength of fit of a regression model.  The exit ticket was aligned to that goal and gave me instant feedback on what students were understanding about correlation coefficients and residual plots.  The results from this exit ticket showed students had a strong understanding of what they were looking for in these different representations (see attached student work).

The one change that I would make to this closing in the future is to extend the task slightly.  I asked students to answer the question and explain their choice.  In the future, I would ask them to explain why the other choices showed a strong linear correlation.  Adding this dimension to the questions would require students to confront their misconceptions (for example, that -0.93 shows a poor fit) and explain each of the choices rather than one of them.  I feel like this would give me even better data on student understanding.

Developing a Conceptual Understanding: Analyzing Multiple Representations

# Creating a Residual Plot

Unit 5: Modeling With Statistics
Lesson 18 of 19

## Big Idea: The residual plot for a regression can help students determine if the right model was used and the strength of correlation.

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40 minutes

### James Bialasik

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