Question

The data below represent the number of days​ absent, x, and the final​ grade, y, for a sample of college students at a large university. Complete parts​ (a) through​ (e) below.

No. of​ absences, x	0	1	2	3	4	5	6	7	8	9
Final​ grade, y	88.6	85.7	82.6	80.1	77.177.1	72.672.6	63.2	67.4	64.4	61.4

​(a) Find the​ least-squares regression line treating the number of​ absences, x, as the explanatory variable and the final​ grade, y, as the response variable.

ModifyingAbove y with caretyequals=nothingxplus+left parenthesis nothing right parenthesis

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

Answer 1

The statistical software output for this problem is:

Hence,

a) Regression equation will be:

= 88.631 + (-3.182) x