Question

A linear model for a set of data was y = -20.6 + 9.72 x and produced the first residual plot [Xscl = 1, Yscl = 5]

Predict the value of y when x = 7.5.
Determine the residual if x = 5

I need some statistics help if anyone could assist that would be great?

Answer 1

what are your thoughts about this so far?

Answer 2

Honestly? I don't even know. That's why I need help. I don't know what I'm supposed to do.

Answer 3

they give you an equation to input the value of x ....

Answer 4

if y = -20.6 + 9.72 x, then when x = 7.5, what is the value of y?

Answer 5

52.3?

Answer 6

yes

Answer 7

the residual is another way of asking what the error is between the modeled line and the actual value

so determine the value of y when x=5, and also find the value of the actual plot of (5,y)

the difference between the actual and the modeled values is the "residual"

Answer 8

How do I find the actual plot?

Answer 9

its either in a dataset or on a graph that they give you

Answer 10

All I got was the graph but I don't know what it is.

Answer 11

i cant read it the way it is either ... if i were to geuss id say the x=5 plot is around y=-1

Answer 12

So what does that mean? How do I get the residual?

Answer 13

like i posted: the difference between the actual and the modeled values is the "residual"

r = actual y - modeled y ; at x=5

Answer 14

the modeled y is simple enough ... they give an equation for it

the actual y would have to be obtained off of the scatterplot ... the xy parts might help to define how the graph is delineated

Answer 15

x is a scale of 1, y is a scale of 5

each x tic measures 1 units
each y tic measures 5 units

Answer 16

so would you agree that it looks to be about 5,-5 ?