Question
DATA SET x y 2.1 3.9 3.8 1.3 2.9 3.6 4.7 4.9 (a) Draw a scatter...
DATA SET
| x | y |
| 2.1 | 3.9 |
| 3.8 | 1.3 |
| 2.9 | 3.6 |
| 4.7 | 4.9 |
(a) Draw a scatter diagram of the data.
Compute the linear correlation coefficient. The linear correlation coefficient for the four pieces of data is____________
(b) Draw a scatter diagram of the data with the additional data point(10.4,9.3).
Compute the linear correlation coefficient with the additional data point. The linear correlation coefficient for the pieces of data is_________
Comment on the effect the additional data point has on the linear correlation coefficient.
A.The additional data point weakens the appearance of a linear association between the data points.
B.The additional data point strengthens the appearance of a linear association between the data points.
C. The additional data point does not affect the linear correlation coefficient
Explain why correlations should always be reported with the scatter diagram
A.The scatter diagram can be used to distinguish between association and causation.
B.The scatter diagram is needed to determine if the correlation is positive or negative.
C.The scatter diagram is needed to see if the correlation coefficient is being affected by the presence of outliers.
Homework Answers
Answer #1
b)
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