1. Estimate the correlation coefficient of the following scattterplot: 2. Draw a
ID: 3074723 • Letter: 1
Question
1. Estimate the correlation coefficient of the following scattterplot: 2. Draw a scatterplot with a correlation coefficient very close to positive 1 3. Draw a scatterplot with a correlation coefficient very close to zero 4. Write a set of rules that a student might use to estimate the correlation coefficient of a scatterplot by looking at it. 5. Which is the higher correlation coefficient, .79 or .79? How do you know that? 6. ls the square root of a positive correlation coefficient bigger or smaller than the correlation coefficient itself? How do you know? 7. In your own words, tell what it means to have a correlation of -1. Give an example of such a correlation. Each of the following statements contains a blunder. Explain in each case what is wrong 8. There is correlation r 0.6 between the gender of students and their scores on a mathematics exam 9. We found a high correlation(r 1.09) between students' scores on the math part of the SAT and their scores on the verbal part of the SAT 10. The correlation between amount of fertilizer and yield of corn was found to be r 0.23 bushelExplanation / Answer
5. Both correlation coefficient, -0.79 and 0.79 are at the same level. Both of them have the same strength 0.79. The difference is just that one has a negative correlation and the other has a positive correlation.
8. Gender of a student is not a numeric data. and correlation is made between two numeric data. So we cant make a correlation between these data.
9. The correlation can't be greater than 1. The maximum value for a correlation is either +1 or -1. So this correlation is wrong.
10. The correlation coefficeint does not have a unit. When you construct the correlation coefficient the units of measurement that are used are cancel out.
So the value of r can not be 0.23 bushel. It can only be r = 0.23 without any unit sign.
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