Question

Help: I"ll medal

Answer 1

@Michele_Laino

Answer 2

what is the meaning of "residual plot"?

Answer 3

A residual plot is a graph that shows the residuals on the vertical axis and the independent variable on the horizontal axis. If the points in a residual plot are randomly dispersed around the horizontal axis, a linear regression model is appropriate for the data; otherwise, a non-linear model is more appropriate.

Answer 4

for question #1) I think that the requested value is:
\(-20.6+(9.72 \cdot 7.5)=...?\)

Answer 5

for the a part?

Answer 6

yes!

Answer 7

52.3

Answer 8

hint:
we have:
\(-20.6+(9.72 \cdot 7.5)=-20.6+72.9=...?\)

Answer 9

correct! it is \(52.3\)

Answer 10

now, for part b), we have to compute the valòue at \(x=5\) first:
\(-20.6+(9.72 \cdot 5)=...\)

Answer 11

28

Answer 12

value*

Answer 13

correct!
then we have to compute this difference:
\(28- \bar y=...?\) where \(\bar y\) is the mean value of \(y\) values

Answer 14

i do not know but maybe -28y

Answer 15

no, please it is \(28 - \bar y\)
I think that, please correct me if I'm wrong, point \((1,5)\) is a point of the plot, right?

Answer 16

um, i dont see it

Answer 17

I used the coordinates which are written in your plot

Answer 18

I think that the right procedure is like below:
we have to compute the \(y-\) value at \(x=1\), so what is:
\(-20.6+(9.72 \cdot 1)=...?\)

Answer 19

-10.88

Answer 20

so the answers are
A. 52.3
B. -10.88

Answer 21

correct!

Answer 22

nevertheless, we have to know, what is the observed value at \(x=5\)

Answer 23

more precisely, \(y=28\) is the predicted value at \(x=5\)

Answer 24

we need to know, what is the observed value at \(x=5\)