Homework Help: Research and Statistics

Posted by Moreen on Saturday, September 11, 2010 at 10:39am.

5. The table below shows Psychology exam scores, Statistics Exam scores, and IQ scores for a random sample of students. What can you observe in the relationship between IQ and psychology, psychology and statistics, and IQ and statistics? Using a web-calculator, obtain the Pearson’s r and coefficient of determination for the following relationships.
a. Between the IQ and psychology scores
b. Between the IQ and statistics scores
c. Between the psychology scores and statistics scores.
Student number IQ Psychology Statistics
101 142 49 49
102 100 30 32
103 103 36 38
104 121 44 41
105 120 35 42
106 115 47 43
107 101 37 35
108 109 45 47
109 111 30 43
110 115 49 46

6. 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 of coffee Stress level
3 5
2 3
4 3
6 9
5 4
1 2
7 10
3 5

Research and Statistics - PsyDAG, Saturday, September 11, 2010 at 11:00am
We do not do your work for you. Once you have answered your questions, we will be happy to give you feedback on your work. Although it might require more time and effort, you will learn more if you do your own work. Isn't that why you go to school?

I assume you can find the web calculator.
Research and Statistics - Jenn, Thursday, April 5, 2012 at 10:16pm
IQ | 1.0000
Psy | 0.5923 1.0000
Stat | 0.7367 0.7105 1.0000

a. corr(iq, psych) = 0.5923; coeff. of det. = 0.3508.
b. corr(iq, stat) = 0.7367; coeff. of det. = 0.5576.
c. corr(stat, psych) = 0.7105; coeff. of det. = 0.5048.
Research and Statistics - Jenn, Friday, April 6, 2012 at 12:43pm
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 of coffee Stress level
3 5
2 3
4 3
6 9
5 4
1 2
7 10
3 5

my professor says it The correlation coefficient is 0.8519. I don't understand how he arrived at this could someone please show me step by step that he would get this answer... Thank you

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