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Draw a scatter diagram of the data

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Reference no: EM132465166

X      Y

2.2   3.9

3.9.  1.4

3.    3.5

4.7    5

?(a) Draw a scatter diagram of the data.

Compute the linear correlation coefficient. The linear correlation coefficient for the four pieces of data is 

?(Round to three decimal places as? needed.)

?(b) Draw a scatter diagram of the data with the additional data point 

 (10.4,9.2). 

Compute the linear correlation coefficient with the additional data point. The linear correlation coefficient for the five pieces of data is  (Round to three decimal places as? needed.)

Comment on the effect the additional data point has on the linear correlation coefficient.

A. The additional data point weakens the appearence of a linear association between the data points.

B. The additional data point strengthens the appearence 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 scatter diagrams.

A. The scatter diagram is needed to see if the correlation coefficient is being affected by the presence of outliers.

B. The scatter diagram can be used to distinguish between association and causation.

C. The scatter diagram is needed to determine if the correlation is positive or negative.

Reference no: EM132465166

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