11. Correlation

Given the following correlation matrix: $\begin{array}{cccc}& X& Y& Z\\ X& 1.00& 0.45& -0.12\\ Y& 0.45& 1.00& 0.30\\ Z& -0.12& 0.30& 1.00\end{array}$ What is the weakest correlation in this matrix? Enter the entire value.

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

Which of the following is the best description of a positive association between two variables?

The correlation between variable $x$ and variable $y$ is represented by which of the following?

Given the following data for variables $x$ and $y$: $x$: $2$, $4$, $6$, $8$; $y$: $3$, $6$, $7$, $10$. What is the value of the Pearson correlation coefficient $r$ between $x$ and $y$?

The sign ($+$ or $-$) of a correlation coefficient is based on whether as one variable increases, the other variable tends to increase or decrease. Which of the following best describes this relationship?

Which of the following $r$-values represents the strongest correlation?

Suppose Figure 1 shows a scatterplot of two variables with points closely clustered around a straight line that slopes upward. Which of the following best describes the statistical relationship indicated in Figure 1?

Which value of the correlation coefficient $r$ indicates a stronger linear relationship between two variables: $r=0.85$ or $r=-0.92$?

Given four scatterplots, each showing a different relationship between variables $X$ and $Y$, which scatterplot would indicate the strongest negative linear association between $X$ and $Y$?

Which of the following best describes how to distinguish between a strong linear association and a weak linear association when using the correlation coefficient?

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

Which value of the correlation coefficient $r$ indicates a stronger correlation than $+0.40$?