Stats calculator question..... Will medal!

- theopenstudyowl

Stats calculator question..... Will medal!

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- theopenstudyowl

l

##### 1 Attachment

- amistre64

well, whats our slope to start with?

- theopenstudyowl

11.78?

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## More answers

- amistre64

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

- theopenstudyowl

0.486

- amistre64

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?

- theopenstudyowl

c and d

- amistre64

explain your reasoning for that ...

- amistre64

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.

- amistre64

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

- theopenstudyowl

l honestly have no idea...

- amistre64

what is the slope of our regression line?

- theopenstudyowl

the slope is 0.486

- theopenstudyowl

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

- amistre64

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

- amistre64

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.

- theopenstudyowl

ok

- amistre64

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

- theopenstudyowl

nope

- amistre64

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.

- theopenstudyowl

ok

- theopenstudyowl

thnxs

- amistre64

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

- theopenstudyowl

ok cool!

- amistre64

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

- theopenstudyowl

0.2316

- amistre64

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

##### 1 Attachment

- amistre64

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

- theopenstudyowl

thanks! for the link

- amistre64

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

- theopenstudyowl

hah nice!

- amistre64

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

- amistre64

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

- theopenstudyowl

@Michele_Laino

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