11. Correlation

$A\; correlation\; indicates\; that\; there\; is\; \_\_\_\_\_\; between\; two\; variables.$

Which of the following is true of the correlation coefficient $r$?

What would the scatter plot look like for data that produce a Pearson correlation coefficient of $r=\mathrm{+0.88}$?

Given four scatterplots labeled A, B, C, and D, the calculated correlation coefficients are as follows: A: $0.9$, B: $-0.8$, C: $0.0$, D: $0.5$. Which scatterplot shows the strongest negative linear relationship?

Which of the following values of the correlation coefficient represents a moderate negative correlation?

Unlike $r^2$, adjusted $r^2$ explicitly accounts for which of the following in regression analysis?

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

The correlation coefficient $r$ measures only the strength of the $\mathrm{linear}$ relationship between variables.

Correlation analysis is used to determine which of the following between two variables?

Which of the following is not one of the three common errors involving $r$ (correlation)?

Which of the following statements concerning correlation analysis is not true?

Which statistic is commonly used to evaluate how well the sample regression equation fits the data?

Which of the following statements is true of correlation analysis?

Given the following paired data: $(1,2)$, $(2,4)$, $(3,6)$, $(4,8)$, what is the value of the Pearson correlation coefficient $r$ for this data set?

Given the following paired data: $(1,2)$, $(2,4)$, $(3,6)$, $(4,8)$, what is the value of the correlation coefficient between $x$ and $y$?