Describing relationships in quantitative data

Progress
Scatterplots and correlation
Regression
Residuals, least-squares regression, and r-squared
Unit test
10 questions
1Take the unit test to identify your areas for growth.
2Review the recommended lessons.
3Test yourself again to show your growth.
Lessons
Scatterplots and correlationRegressionResiduals, least-squares regression, and r-squaredUnit test
Scatterplots and correlation
Learn
Constructing a scatter plot
Scatter plots: studying, shoe size, and test scores
Scatter plot: smokers
Positive and negative correlations in scatterplots
Outliers in scatter plots
Clusters in scatter plots
Example: Correlation coefficient intuition
Scatterplots and correlation review
Correlation coefficient review
Practice
Constructing scatter plots
4 questions
Completed
Making good scatter plots
4 questions
Practice
Positive and negative linear correlations from scatter plots
100%
Completed
Describing trends in scatter plots
7 questions
Practice
Correlation coefficient intuition
7 questions
Practice
Regression
Learn
Fitting a line to data
Estimating the line of best fit exercise
Line of best fit: smoking in 1945
Interpreting a trend line
Equations of trend lines: Phone data
Linear regression review
Practice
Eyeballing the line of best fit
100%
Completed
Estimating slope of line of best fit
100%
Completed
Estimating equations of lines of best fit, and using them to make predictions
100%
Completed
Interpreting slope and y-intercept for linear models
100%
Completed
Residuals, least-squares regression, and r-squared
Learn
Introduction to residuals
Squared error of regression line
Proof (part 1) minimizing squared error to regression line
Proof (part 2) minimizing squared error to regression line
Proof (part 3) minimizing squared error to regression line
Proof (part 4) minimizing squared error to regression line
Regression line example
Second regression example
R-squared or coefficient of determination
Calculating R-squared
Covariance and the regression line
Unit test
Test your understanding of Describing relationships in quantitative data with these 10 questions.

It takes about 15 to 20 minutes to finish this test.