Are the residual standard deviations the same

Reference no: EM131009573

(Computer exercise) The accompanying table gives two data sets: (A) and (B). The values of X are the same for both data sets and are given only once.

(A) (B)			(A) (B)
X	Y	Y	X	Y	Y
0.61	0.88	0.96	2.56	1.97	1.20
0.93	1.02	0.97	2.74	2.02	3.59
1.02	1.12	0.07	3.04	2.26	3.09
1.27	1.10	2.54	3.13	2.27	1.55
1.47	1.44	1.41	3.45	2.43	0.71
1.71	1.45	0.84	3.48	2.57	3.05
1.91	1.41	0.32	3.79	2.53	2.54
2.00	1.59	1.46	3.96	2.73	3.33
2.27	1.58	2.29	4.12	2.92	2.38
2.33	1.66	2.51	4.21	2.96	3.08

(a) Verify that the fitted regression line is almost exactly the same for all three data sets. Are the residual standard deviations the same? Are the values of r the same?

(b) Construct a scatterplot for each of the data sets. What does each plot tell you about the appropriateness of linear regression for the data set?

Reference no: EM131009573

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