theopenstudyowl
  • theopenstudyowl
Stats calculator question..... Will medal!
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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theopenstudyowl
  • theopenstudyowl
amistre64
  • amistre64
well, whats our slope to start with?
theopenstudyowl
  • theopenstudyowl
11.78?

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amistre64
  • amistre64
the regression equation is: _______ the equation is already presented to you in slope intercept format. on the first line or 2
theopenstudyowl
  • theopenstudyowl
0.486
amistre64
  • 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
  • theopenstudyowl
c and d
amistre64
  • amistre64
explain your reasoning for that ...
amistre64
  • 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
  • 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
  • theopenstudyowl
l honestly have no idea...
amistre64
  • amistre64
what is the slope of our regression line?
theopenstudyowl
  • theopenstudyowl
the slope is 0.486
theopenstudyowl
  • theopenstudyowl
oh, so would it be a and b..?
amistre64
  • 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
  • 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
  • theopenstudyowl
ok
amistre64
  • amistre64
the standard error of the slope .... this part is formulaic. do you know the formula?
theopenstudyowl
  • theopenstudyowl
nope
amistre64
  • 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
  • theopenstudyowl
ok
theopenstudyowl
  • theopenstudyowl
thnxs
amistre64
  • amistre64
well, ive found some good news, we dont really need the formula since we have the output given to us
theopenstudyowl
  • theopenstudyowl
ok cool!
amistre64
  • amistre64
it appears that the standard error (standard deviation in some cases) of our test1 predictor is .... what does the output say?
theopenstudyowl
  • theopenstudyowl
0.2316
amistre64
  • 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
  • amistre64
http://stattrek.com/regression/slope-confidence-interval.aspx?Tutorial=AP
theopenstudyowl
  • theopenstudyowl
thanks! for the link
amistre64
  • amistre64
yep, thats how i study and make sure im at least on the right track.
theopenstudyowl
  • theopenstudyowl
hah nice!
amistre64
  • 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
  • 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
  • theopenstudyowl
@Michele_Laino

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