# Biomedical research methods

Please see attached 1.Below are two sets of scores.For each, do the following: Compute a Pearson correlation coefficient for each set of scores.You can do this in matlab Plot the scores from each set on a separate scatterplot.Compare the correlation coefficients that you obtained2. Describe one major difference between correlation and regression and describe 2 hypothetical research scenarios:
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BE 447/547 Homework 5
Due Monday, 16 April 2018 in or before class
1. Below are two sets of scores. For each, do the following:
a. Compute a Pearson correlation coefficient for each set of scores. You can
do this in matlab using the function corr or in Excel using the function
correl. Obtain the Pearson r, and relevant means and standard
deviations. (3 points)
b. Plot the scores from each set on a separate scatterplot. Inspect the
scatterplot and report whether the data met the assumptions of the
Pearson correlation coefficient analysis. (2 points)
c. Compare the correlation coefficients that you obtained, and inspect your
scatterplots. Can you think of any reasons why the correlation coefficients
differed the way they did? Is the Pearson correlation coefficient
appropriate for both sets of scores? Why or why not? (2 points)
Set 1
x
1
1
2
2
2
3
3
4
5
5
5
6
6
6
7
Set 2
y
1
2
1
2
4
4
5
7
7
4
5
4
2
1
1
x
1
2
3
2
3
4
6
6
3
7
4
7
5
3
5
y
2
3
5
1
4
5
7
6
2
5
3
7
5
1
6
2. Describe one major difference between correlation and regression and describe
2 hypothetical research scenarios: 1 for which correlation analysis is appropriate,
and 1 for which regression analysis is appropriate. (3 points)

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