Correlation #2

Front

What type of association does a graph with a downward slope indicate?

Back

Negative association.

Front

What does a product moment correlation coefficient of 0.9 indicate about the relationship between two variables?

Back

There is a strong positive linear correlation between x and y.

Front

How would you classify a correlation coefficient of -0.26?

Back

Weak correlation.

Front

For which type of functions is the correlation coefficient (r) useful?

Back

Linear functions.

Front

Does correlation apply to both quantitative and categorical data?

Back

False.

Front

What is the range of values for a correlation coefficient?

Back

-1 to 1.

Front

What does a correlation coefficient of 0 indicate?

Back

No correlation.

Front

What does a positive correlation coefficient signify?

Back

As one variable increases, the other variable also increases.

Front

What does a negative correlation coefficient signify?

Back

As one variable increases, the other variable decreases.

Front

What is the formula for calculating the correlation coefficient (r)?

Back

r = (nΣxy - ΣxΣy) / sqrt[(nΣx^2 - (Σx)^2)(nΣy^2 - (Σy)^2)]