Question

These are the values in Rita’s data set.

(1, 19), (2, 33), (4,45), (5, 57), (6,71.5)

Rita determines the equation of a linear regression line to be yˆ=9.7x+10.3 .

Use the point tool to graph the residual plot for the data set.

Round residuals to the nearest unit as needed.

Answer 1

hints:

residual = observed - predicted

use the equation provided yˆ=9.7x+10.3 to calculate the predicted y^ value for each x value

then calculate the residuals

then plot them on the graph

Answer 2

Yeah sorry @Vocaloid have to keep getting on and off the site.

Answer 3

19^=9.7(1)+10.3 is that how I would do it?

Answer 4

19 is your observed value, not predicted, so you would instead:

y^ = 9.7(1) + 10.3 and solve for y^

Answer 5

ohhh, and do that for all my numbers?

Answer 6

yup

Answer 7

so then i would have to do 19-20=1 and so on?

Answer 8

*-1, yes. that would be your residual so you would plot (1,-1)

Answer 9

I've done the calculations already, so when you are done, you can check them against mine

Answer 10

(2,3.3) (4,4.1) (5,1.8) (6,3) is what i got

Answer 11

that was before i rounded though

Answer 12

check your signs, remember it is observed - predicted

Answer 13

some of your residuals should be negative

Answer 14

(2,3.3) (4,-4.1) (5-,1.8) (6,3) then they round to (2,3) (4,-4) (5,-2) (6,3)

Answer 15

perfect! now you can plot your residuals

Answer 16

Thanks :D

Answer 17

Sorry I took so long, I am not the best at understanding things, lol.

Answer 18

nah, you're good, don't apologize

Answer 19

Ok well thanks :D