A data analyst performs a correlation analysis between two quantities. The result of the analysis is an r value of 0. What does this mean?
- The analysis failed.
- The two variables have no relationship.
- Neither variables changed during the period.
- When one variable increases its value, the other variable reduces its value.
Explanation: The commonly used correlation coefficient, Pearson r, (or r value), is a quantity that is expressed as a value between -1 and 1. Positive values indicate a positive relationship between the changes in two quantities. Negative values indicate an inverse relationship. The magnitude of either the positive or negative values indicates the degree of correlation. The closer the value is to 1 or -1, the stronger the relationship. 0 indicates no relationship.
Exam with this question: Big data & Analytics Chapter 3 Quiz Answers – Data Analysis
Please login or Register to submit your answer