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theopenstudyowl

  • one year ago

Stats calculator question..... Will medal!

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  1. theopenstudyowl
    • one year ago
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    l

  2. amistre64
    • one year ago
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    well, whats our slope to start with?

  3. theopenstudyowl
    • one year ago
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    11.78?

  4. amistre64
    • one year ago
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    the regression equation is: _______ the equation is already presented to you in slope intercept format. on the first line or 2

  5. theopenstudyowl
    • one year ago
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    0.486

  6. amistre64
    • one year ago
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    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?

  7. theopenstudyowl
    • one year ago
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    c and d

  8. amistre64
    • one year ago
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    explain your reasoning for that ...

  9. amistre64
    • one year ago
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    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.

  10. amistre64
    • one year ago
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    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

  11. theopenstudyowl
    • one year ago
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    l honestly have no idea...

  12. amistre64
    • one year ago
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    what is the slope of our regression line?

  13. theopenstudyowl
    • one year ago
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    the slope is 0.486

  14. theopenstudyowl
    • one year ago
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    oh, so would it be a and b..?

  15. amistre64
    • one year ago
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    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

  16. amistre64
    • one year ago
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    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.

  17. theopenstudyowl
    • one year ago
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    ok

  18. amistre64
    • one year ago
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    the standard error of the slope .... this part is formulaic. do you know the formula?

  19. theopenstudyowl
    • one year ago
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    nope

  20. amistre64
    • one year ago
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    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.

  21. theopenstudyowl
    • one year ago
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    ok

  22. theopenstudyowl
    • one year ago
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    thnxs

  23. amistre64
    • one year ago
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    well, ive found some good news, we dont really need the formula since we have the output given to us

  24. theopenstudyowl
    • one year ago
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    ok cool!

  25. amistre64
    • one year ago
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    it appears that the standard error (standard deviation in some cases) of our test1 predictor is .... what does the output say?

  26. theopenstudyowl
    • one year ago
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    0.2316

  27. amistre64
    • one year ago
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    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

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  28. amistre64
    • one year ago
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    http://stattrek.com/regression/slope-confidence-interval.aspx?Tutorial=AP

  29. theopenstudyowl
    • one year ago
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    thanks! for the link

  30. amistre64
    • one year ago
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    yep, thats how i study and make sure im at least on the right track.

  31. theopenstudyowl
    • one year ago
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    hah nice!

  32. amistre64
    • one year ago
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    i wasnt sure if we needed to modify the deviation that was listed, or just use it. stat trek says to just use it

  33. amistre64
    • one year ago
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    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

  34. theopenstudyowl
    • one year ago
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    @Michele_Laino

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