Question 1

The range of the correlation coefficient is from -1.00 to ____________________.

Accepted Answer

The answer of The range of the correlation coefficient is...

Question 2

What is the Pearson correlation coefficient?

Accepted Answer

The answer of What is the Pearson correlation coefficient?...

Question 3

Outliers are most likely to raise interpretational complexities when sample sizes are small.

Accepted Answer

When the sample size is small, outliers have a greater impact on the overall results and can skew the interpretation of the data. With larger sample sizes, outliers have less of an effect and the data tends to be more representative of the population.

Question 4

In statistical computer output,when every variable of interest is correlated with every other variable,the output contains a correlation ____________________.

Accepted Answer

The answer of In statistical computer output,when every variable of...

Question 5

What does the slope of a line refer to?

Accepted Answer

The answer of What does the slope of a line...

Question 6

When a regression equation is computed using standardized X and Y scores,the slope will always equal 0.

Accepted Answer

When standardized scores are used, the slope of the regression line represents the correlation coefficient (r) between the two variables. It can take any value between -1 and 1, indicating a positive, negative, or zero correlation between the variables. Therefore, the slope will not always equal 0.

Question 7

Regarding correlation and causation,if we observe a positive correlation between two variables,we cannot conclude that there is a ____________________ relationship between the two variables.

Accepted Answer

The answer of Regarding correlation and causation,if we observe a...

Question 8

Restricting the range of two variables will always lower the correlation between them.

Accepted Answer

Restricting the range of two variables can lead to an underestimation of the true correlation between them, but it does not always lower the correlation. The effect depends on the distribution and relationship of the variables within the restricted range.

Question 9

The problem of ____________________ occurs when only a limited portion of the possible range of scores is used to calculate a correlation coefficient and a regression equation.

Accepted Answer

The answer of The problem of ____________________ occurs when only...

Question 10

A ____________________ is a graph that represents values for X and Y for each person in the data set.

Accepted Answer

The answer of A ____________________ is a graph that represents...

Question 11

Correlation and regression are appropriate for both linear and nonlinear relationships.

Accepted Answer

The answer of Correlation and regression are appropriate for both...

Question 12

The regression equation for predicting X from Y is not the same as the regression equation for predicting Y from X.

Accepted Answer

This is because the slope and intercept of the regression line will be different when predicting X from Y compared to predicting Y from X.

Question 13

The magnitude of a correlation coefficient is determined by examining the absolute of the correlation coefficient.

Accepted Answer

The absolute value of a correlation coefficient gives the magnitude or strength of the relationship, regardless of whether it is positive or negative.

Question 14

When two variables (X and Y)are strongly correlated we can be reasonably sure that X causes Y.

Accepted Answer

While strong correlation between X and Y may provide a hint about a possible relationship, it does not prove causation. There could be other variables that are causing both X and Y to vary together or the relationship could be coincidental. Further statistical analysis and study designs (such as experimental studies with controlled variables) are necessary to establish causation.

Question 15

The correlation of any variable with itself is always ____________________.

Accepted Answer

The answer of The correlation of any variable with itself...

Question 16

A single case that can drastically change a correlation coefficient is called an ____________________.

Accepted Answer

The answer of A single case that can drastically change...

Question 17

The ____________________ minimizes the sum of the squared discrepancies between the predicted and observed Y scores.

Accepted Answer

The answer of The ____________________ minimizes the sum of the...

Question 18

Pearson correlation is an appropriate statistic for a nonlinear relationship.

Accepted Answer

Pearson correlation only measures linear relationships. For nonlinear relationships, other correlation measures like Spearman's rank correlation or Kendall's tau correlation should be used.

Question 19

Pearson correlation and regression can be used to determine the extent to which a data set approximates a ____________________ relationship.

Accepted Answer

The answer of Pearson correlation and regression can be used...

Question 20

An inverse relationship and a ____________________ relationship are the same thing.

Accepted Answer

The answer of An inverse relationship and a ____________________ relationship...

Quiz 5: Pearson Correlation and Regression: Descriptive Aspects