11. Correlation

Which of the following $r$-values represents the most moderate correlation?

Which of the following $r$-values represents the weakest correlation between two variables?

Which of the following best describes the $r$ (correlation coefficient) between the weight and price of a box of cereal, assuming that as the weight increases, the price also tends to increase?

Which of the following is a property of the linear correlation coefficient $r$?

Which of the following scatterplots best represents a negative linear relationship between $x$ and $y$?

Which of the following statements about the correlation coefficient is true?

Which of the following can be used to show a cause-and-effect relationship between two variables?

Which of the following tables shows a negative correlation between variables $X$ and $Y$?

Which of the following best describes all possible values that the correlation coefficient $r$ can take?

Which of the following is a characteristic of the correlation coefficient?

Suppose you are shown four scatterplots, each with a calculated correlation coefficient. Which of the following correlation coefficients indicates the strongest linear relationship between the two variables?

Which of the following tables shows no correlation between variables $X$ and $Y$?

Given a dataset where as one variable increases, the other variable tends to decrease moderately, which of the following values is the most likely correlation coefficient for this data?

Which value of the correlation coefficient $r$ indicates a stronger linear relationship: $r=0.85$ or $r=-0.65$?

What is the most likely value of the correlation coefficient between a stock-index mutual fund and the $S\&P500$ index?