Correlation Analysis Quiz

What does a correlation coefficient of 0.8 indicate about the relationship between two variables?

• Strong correlation

• Moderate correlation

• Weak correlation

• No correlation

Which of the following is an example of a positive correlation?

• As product price increases, sales volume increases

• As temperature decreases, ice cream sales increase

• As age increases, salary decreases

• As body size increases, shoe size increases

What type of relationship does the Pearson correlation coefficient measure?

• Non-linear relationship

• Linear relationship

• Causal relationship

• Ordinal relationship

In the Pearson correlation formula, what does the denominator ensure?

• The correlation coefficient is between -1 and 1

• The correlation coefficient is always positive

• The correlation coefficient is greater than 1

• The correlation coefficient is less than -1

How does Spearman rank correlation differ from Pearson correlation?

• It requires normally distributed data

• It uses ranks instead of raw data

• It measures non-linear relationships

• It uses raw data instead of ranks

What is the Spearman rank correlation coefficient if there are no rank ties?

• It is always 0

• It cannot be calculated

• It is always 1

• It can be calculated using a specific formula

When should Kendall's Tau be preferred over Spearman's rank correlation?

• When there are many rank ties

• When data is normally distributed

• When there are no rank ties

• When data is linear

What type of variables does the point-biserial correlation examine?

• Two ordinal variables

• Two metric variables

• A dichotomous and a metric variable

• Two dichotomous variables

In the point-biserial correlation example, what score is assigned to students who passed the test?

• 0

• 1

• 3

• 2

What is a dichotomous variable?

• A variable with two values

• A variable with ordinal values

• A variable with more than two values

• A variable with continuous values