Question

Stats calculator question..... Will medal!

Answer 1

l

Answer 2

well, whats our slope to start with?

Answer 3

11.78?

Answer 4

the regression equation is: _______

the equation is already presented to you in slope intercept format. on the first line or 2

Answer 5

0.486

Answer 6

we are using test1 to predict test2

test1 is our independant variable, consider it an x

and yes, thats the slope we want to interval about.

what does this narrow our options to?

Answer 7

c and d

Answer 8

explain your reasoning for that ...

Answer 9

when we are developing a confidence interval for a given sample, we take the sample data as a basis for the interval, we center the interval around the samples data.

spose a given sample has a mean of 3, and we want some interval to determine a range for the populations mean:

3 +- (something) defines the interval.

Answer 10

we are trying to determine a interval for a slope

our data in this case, is centered about the slope of the regression line.

slope +- (something) is our interval

Answer 11

l honestly have no idea...

Answer 12

what is the slope of our regression line?

Answer 13

the slope is 0.486

Answer 14

oh, so would it be a and b..?

Answer 15

since we are trying to determine a interval for a slope

our data in this case, is centered about the slope of the regression line.

slope +- (something) , is our interval
^^^^


right, A or B is going to be the most feasible options

Answer 16

now the question does not correspond to the solutions, in that 2.048 doesnt seem to be related to a 95% confidence interval, but we have to accept it nonetheless.

Answer 17

ok

Answer 18

the standard error of the slope .... this part is formulaic. do you know the formula?

Answer 19

nope

Answer 20

then you really cant proceed until you study up on it ... you know have a focus to study on.

when you can determine the formula for me, we can proceed.

Answer 21

ok

Answer 22

thnxs

Answer 23

well, ive found some good news, we dont really need the formula since we have the output given to us

Answer 24

ok cool!

Answer 25

it appears that the standard error (standard deviation in some cases) of our test1 predictor is .... what does the output say?

Answer 26

0.2316

Answer 27

yep

so, as long as the google isnt lieing to me :)

slope +- z(se) is our desired solution

we know the slope, and the se ... and the z is the same regardless of our options

Answer 28

http://stattrek.com/regression/slope-confidence-interval.aspx?Tutorial=AP

Answer 29

thanks! for the link

Answer 30

yep, thats how i study and make sure im at least on the right track.

Answer 31

hah nice!

Answer 32

i wasnt sure if we needed to modify the deviation that was listed, or just use it.

stat trek says to just use it

Answer 33

the 2.046 is better related to the z score of a 96% confidence interval

1.95 is the usual value for a 95% interval. so i dont know why they used the z value they did for this question

but thats immaterial overall

Answer 34

@Michele_Laino