The following are midterm and ?nal examination test scores for 10 students from a calculus class, wherex denotes the midterm score and y denotes the ?nal score for each student.
|
x
|
68
|
87
|
75
|
91
|
82
|
77
|
86
|
82
|
75
|
79
|
|
y
|
74
|
79
|
80
|
93
|
88
|
79
|
97
|
95
|
89
|
92
|
(a) Calculate the least-squares regression line for these data.
(b) Plot the points and the least-squares regression line on the same graph.