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?
Yes, using http://easycalculation.com/statistics/correlation.php
I get .8519
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.
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).
Based on the data you provided and the correlation coefficient you obtained (0.8519), it seems that you have correctly found the correlation between the number of cups of coffee consumed per day and the stress levels of the college students. The correlation coefficient of 0.8519 indicates a strong positive correlation between these two variables.
To arrive at this result, you used a web-calculator. The specific steps to obtain the correlation coefficient using a web-calculator would typically involve entering the data for the number of cups and stress level into the calculator and selecting the appropriate option to calculate the correlation coefficient. The calculator would then compute the correlation coefficient for you.
Therefore, based on your provided correlation coefficient, it appears that you obtained the correct result.