Correlation

Front

What is the correlation coefficient based on?

Back

The residuals for each data point, how far away the data points are from the line of best fit, actual y values for each data point - predicted y values on the line of best fit.

Front

What does a strong, positive correlation indicate about the correlation value?

Back

A strong, positive correlation indicates a correlation value (r) close to 1.

Front

What is a false statement regarding the correlation between the number of storks and the number of births?

Back

If we breed more storks, there will be more humans born.

Front

What correlation value would be appropriate for a scatterplot of 'number of inches of rain in a storm' and '$ amount of home insurance claims'?

Back

r = 0.87.

Front

What correlation value would you expect for 'grams of fat' and 'calories' in salad dressing?

Back

r = 0.89.

Front

Define correlation in statistics.

Back

Correlation is a statistical measure that describes the extent to which two variables change together.

Front

What does a correlation value of 0 indicate?

Back

A correlation value of 0 indicates no linear relationship between the two variables.

Front

What does a negative correlation value signify?

Back

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

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 correlation value of -1 indicate?

Back

A correlation value of -1 indicates a perfect negative linear relationship between two variables.