In a study on caffeine and stress, college students indicated how many cups of coffee they drink per day and their current stress level on a scale of 1 to 10. The table shows the survey results. Using a web-calculator, obtain the appropriate correlation coefficients.

Question

In a study on caffeine and stress, college students indicated how many cups of coffee they drink per day and their current stress level on a scale of 1 to 10. The table shows the survey results.  Using a web-calculator, obtain the appropriate correlation coefficients. 
Number of cups   Stress level 
3	            5
2	            3
4	            3
6	            9
5	            4
1	            2
7	           10
3	            5

Total Numbers: 8
Correlation: 0.8519

Did I answer this correctly?

Damon · Answer

Yes, using http://easycalculation.com/statistics/correlation.php I get .8519

SHelia · Answer

Thank you for your help. I used that same webpage for help but I still wasn't sure that I was doing it correctly. Thanks for double checking.

sharon · Answer

Please note that stress variable can assume only two values high or low. Is it not nominal ? (You are told that this study was looking at the effects of stress (low or high) on consumption of caffeine).