Question

In: Statistics and Probability

Consider the data. xi 3 12 6 20 14 yi 65 40 60 15 20 The...

Consider the data.

xi

3 12 6 20 14

yi

65 40 60 15 20

The estimated regression equation for these data is

ŷ = 75.75 − 3.25x.

(a)

Compute SSE, SST, and SSR using equations

SSE = Σ(yiŷi)2,

SST = Σ(yiy)2,

and

SSR = Σ(ŷiy)2.

SSE = SST = SSR =

(b)

Compute the coefficient of determination

r2.

(Round your answer to three decimal places.)

r2

=

Comment on the goodness of fit. (For purposes of this exercise, consider a proportion large if it is at least 0.55.)

The least squares line did not provide a good fit as a large proportion of the variability in y has been explained by the least squares line.The least squares line provided a good fit as a large proportion of the variability in y has been explained by the least squares line.     The least squares line did not provide a good fit as a small proportion of the variability in y has been explained by the least squares line.The least squares line provided a good fit as a small proportion of the variability in y has been explained by the least squares line.

(c)

Compute the sample correlation coefficient. (Round your answer to three decimal places.)

Solutions

Expert Solution


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