8. Two Variable Data Analysis

8.01 Scatterplots

Investigation: Scatterplots and body measurements

Investigation: Correlation

8.02 Correlation and r value

Investigation: Explanation of causality, or no causality

8.03 Fitting a straight line - least squares regression

Investigation: Line of best fit using technology

8.04 Interpreting and making predictions

Investigation: Errors in extrapolation

Grade 9

8.02 Correlation and r value

Interactive practice questions

Identify the correlation between $the age of a child and their clothing size$ .

A positive correlation

A

A negative correlation

B

No correlation

C

Easy

< 1min

Identify the correlation between $the age of a person and how funny they are$ .

Easy

< 1min

Identify the correlation between $the temperature and the number of heaters sold$ .

Easy

< 1min

Is there a causal relationship between $the number of times a coin lands on heads and the likelihood that it lands on heads on the next flip$ ?

Medium

< 1min

Outcomes

9.B3.5

Pose and solve problems involving rates, percentages, and proportions in various contexts, including contexts connected to real-life applications of data, measurement, geometry, linear relations, and financial literacy.

9.D1.3

Create a scatter plot to represent the relationship between two variables, determine the correlation between these variables by testing different regression models using technology, and use a model to make predictions when appropriate.

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