Homework Help: math

Posted by john on Monday, May 5, 2008 at 10:53pm.

can someone please help me fast before midnight.
a)I need the correlation between x and y
b)slope of linear regression
c)y intercept of linear regression for the points
(1,8)(2,6)(3,4)(4,2)(5,5)

math - Reiny, Tuesday, May 6, 2008 at 8:40am
Your first 4 points follow a nice linear relation, the last point does not fit the pattern, perhaps you made a typo.

taking any two of the first two points gives us a slope of -2

using y = mx + b gives us y = -2x + b
sub in any point, e.g. (1,8)

8 = -2(1) + b
b = 10

a) the correlation between x and y is
y = -2x + 10

b) slope = -2

c) y intercept is 10

(your last point given (5,5) should have been (5,0) making it the x-intercept)

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