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Posted by on Saturday, February 5, 2011 at 4:48pm.

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?

  • Statistics - , Saturday, February 5, 2011 at 5:01pm

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

  • Statistics - , Saturday, February 5, 2011 at 5:11pm

    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.

  • Statistics - , Tuesday, March 27, 2012 at 12:48am

    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).

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