Scatterplots #4: Correlation Coefficients - 25 Qs

Front

What is a correlation coefficient?

Back

A correlation coefficient is a statistical measure that describes the strength and direction of a relationship between two variables, typically denoted as 'r'.

Front

What does an r value of 1 indicate?

Back

An r value of 1 indicates a perfect positive correlation, meaning that as one variable increases, the other variable also increases in a perfectly linear manner.

Front

What does an r value of -1 indicate?

Back

An r value of -1 indicates a perfect negative correlation, meaning that as one variable increases, the other variable decreases in a perfectly linear manner.

Front

What does an r value of 0 indicate?

Back

An r value of 0 indicates no correlation between the two variables, meaning there is no predictable relationship between them.

Front

What is the range of possible values for a correlation coefficient?

Back

The range of possible values for a correlation coefficient is from -1 to 1.

Front

What does a moderate positive correlation look like on a scatterplot?

Back

A moderate positive correlation on a scatterplot shows a trend where points are generally rising from left to right, but with some scatter.

Front

What does a weak negative correlation look like on a scatterplot?

Back

A weak negative correlation on a scatterplot shows a slight downward trend from left to right, but points are widely scattered.

Front

What is the significance of an r value of 0.47?

Back

An r value of 0.47 indicates a moderate positive correlation between the two variables.

Front

Which of the following is NOT a possible value of r? -0.9898, 1.00, 2.56, -0.027

Back

2.56 is NOT a possible value of r, as correlation coefficients must be between -1 and 1.

Front

What does a strong positive correlation indicate?

Back

A strong positive correlation indicates that as one variable increases, the other variable tends to increase as well, with very little scatter in the data.