Basic Skills and Concepts
1 Correlation and Causality: What is meant by the statement that correlation does not imply causality?
2 Cause of Global Warming: If we find that there is a linear correlation between the concentration of carbon dioxide (CO2) in our atmosphere and the global temperature, does that indicate that changes in the concentration of carbon dioxide cause changes in the global temperature? Why or why not?
2: Basic Skills and Concepts
1 Best-Fitting Line: In what sense is the regression line the straight line that "best" fits the points in a scatterplot?
Statistical Literacy and Critical Thinking
1 Matched Pairs: Section 10-2 deals with correlation and Section 9-4 deals with inferences from matched pairs. Given that both sections deal with matched pairs of sample data, what is the basic difference between the goals of those two sections?
Interpreting r :A jeweler at Tiffany & Company computes the value of the linear correlation coefficient for pairs of sample data consisting of Tiffany prices for gold wedding rings and the corresponding prices at a discount store. She obtains a value of r = 1 and concludes that the prices at both companies are the same. Is she correct? Why or why not?