test 6. Take a Test Hosea Mccc x Search Textbook Soluti x L How to Teke a screen
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test 6.
Take a Test Hosea Mccc x Search Textbook Soluti x L How to Teke a screenshc x C Secure h ps://www. mathxl.com Test aspx?testld 157683686 /Student/Player Hosea McConnell 4/29/17 10:15 PM MAT220.30: Statistics IMOD4 ONLINE (3/6-4/30/17)] Test POST UNIT 8 TEST Ch. 4 Submit Test This Test: 14 pts possible 6 of 14 (11 complete This Question 1 pt Question Help Consider the data on the right. (a) Draw a scatter diagram of the data and compute the linear correlation coefficient. (b) Draw a scatter diagram of the data and compute the linear correlation coefficient with the additional data point (10.4.9.4). Comment on the effect the additional data point has on the linear correlation coefficient. Explain why correlations should always be 2.2 4 reported with scatter diagrams. 3.9 1.4 2.9 3.6 4.7 4.9 a) Which of the following best represents the data? O A. O B. O c. O D. 0 2 4 6 2 4 6 The linear correlation coemicient 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 (10.4.9.4). Click to select your answer(s) 9:16 PM Type here to search 4/29/2017Explanation / Answer
a. The diagram 3 best represents the scatter diagram. Hence option C is correct
The correlation coefficient for these 4 points is 0.025( IN EXCEL)
b. The plot after adding the point(10.4,9.4) is plot A
The correlation coefficient for these 5 points is 0.863( IN EXCEL)
c. The addition point increases r considerably and hence strengthens the linear relationship between x and y
d. Scatter plots show the outliers present in the data and their effect on the correlation coefficient can be seen.
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