10.1 Correlation Practice

Front

What is correlation in statistics?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. It indicates the strength and direction of a linear relationship between the variables.

Front

What does a positive correlation indicate?

Back

A positive correlation indicates that as one variable increases, the other variable also tends to increase.

Front

What does a negative correlation indicate?

Back

A negative correlation indicates that as one variable increases, the other variable tends to decrease.

Front

What does no correlation mean?

Back

No correlation means that there is no discernible relationship between the changes in two variables.

Front

How can you visually identify correlation in a scatterplot?

Back

In a scatterplot, correlation can be identified by the pattern of the points. A rising pattern indicates positive correlation, a falling pattern indicates negative correlation, and a random pattern indicates no correlation.

Front

What is the range of correlation coefficients?

Back

The range of correlation coefficients is from -1 to +1. A coefficient of +1 indicates perfect positive correlation, -1 indicates perfect negative correlation, and 0 indicates no correlation.

Front

What is the purpose of using correlation in data analysis?

Back

The purpose of using correlation in data analysis is to identify and quantify the strength and direction of relationships between variables, which can inform predictions and decision-making.

Front

What is a scatterplot?

Back

A scatterplot is a graphical representation of two variables where each point represents an observation. It is used to visualize the relationship between the variables.

Front

What does it mean if a scatterplot shows a downward trend?

Back

A downward trend in a scatterplot indicates a negative correlation between the two variables, meaning that as one variable increases, the other tends to decrease.

Front

What is the significance of the correlation coefficient value of 0.8?

Back

A correlation coefficient value of 0.8 indicates a strong positive correlation between the two variables.