A study was conducted to determine whether the final grade of a student in an introductory...

Student	Verbal Score ?x	Final Grade ?y
11	3636	9090
22	7474	8484
33	4848	8686
44	7474	6868
55	8080	7676
66	2828	9191
77	7272	9797
88	6767	9494
99	3131	7777
1010	2727	9797

Find the following:

(a) The correlation coefficient: r=

(b) The least squares line: ?̂ =

Solutions

Expert Solution

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(a) The correlation coefficient: r= -0.34 (negative and weak correlation between the variables)

(b) The least squares line: ?̂ = -0.153x + 94.190 (highlighted in the summary output)

(c) Calculate the residual for the fifth student: -5.989 is the residual for the fifthe student ( highlighted in the summary output)

orchestra answered 1 year ago

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