Georgia standard · Mathematics

`8.FGR.6`Bivariate Quantitative Data

Solve practical, linear problems involving situations using bivariate quantitative data.

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Expectations

8.FGR.6.1
Show that straight lines are widely used to model relationships between two quantitative variables. For scatter plots that suggest a linear association, visually fit a straight line, and informally assess the model fit by judging the closeness of the data points to the line of best fit.
8.FGR.6.2
Use the equation of a linear model to solve problems in the context of bivariate measurement data, interpreting the slope and intercepts.
8.FGR.6.3
Explain the meaning of the predicted slope (rate of change) and the predicted intercept (constant term) of a linear model in the context of the data.
8.FGR.6.4
Use appropriate graphical displays from data distributions involving lines of best fit to draw informal inferences and answer the statistical investigative question posed in an unbiased statistical study.

Mathematics Grade 8 (EOG) · Functional & Graphical Reasoning
Solve practical, linear problems involving situations using bivariate quantitative data.
about 10% of the test · 6 points

Georgia's Achievement Level Descriptors. The levels are cumulative: each includes the ones before it. Proficient is on grade level.

Developing: Determine whether a scatter plot is represented by a linear association and, if so, whether that association is positive or negative. Given a scatter plot and the line of best fit or an equation of the line of best fit, use a value of one variable to predict the value of the other variable.
Proficient: Construct an estimated line of best fit and assess whether a given line is a good fit by judging the closeness of the data points. Interpret the slope and y-intercept of a line of best fit in the context of a realistic problem.
Distinguished: Write an equation for the line of best fit and analyze data distributions involving lines of best fit to make informal inferences and answer statistical investigative questions.