Thank you for the opportunity to help you with your question!

r = 0.91

What does this tell us?

To interpret the value of r you need to follow these guidelines:

r always lies in the range -1 to +1. If it lies close to either of these two values, then the dispersion of the scattergram points is small and therefore a strong correlation exists between the two variables.

For r to equal exactly -1 or +1 must mean that correlation is perfect and all the points on the scattergram lie on the line of best fit (otherwise known as the regression line.) If r is close to 0, the dispersion is large and the variables are uncorrelated. The positive or negative sign on the value of r indicates positive or negative correlation.

So in the above case, there is evidence of strong positive correlation.

Please let me know if you need any clarification. I'm always happy to answer your questions.

Aug 8th, 2015

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