anonymous
  • anonymous
Height (ft) Interval after (min) 96 68 111 80 76 66 91 72 66 58 108 79 116 84 91 79 The data show the time intervals after an eruption (to the next eruption) of a certain geyser. Find the regression equation, letting the first variable be the independent (x) variable. Find the best predicted tie of the interval after an eruption given that the current eruption has a height of 84 feet. Use a significant level of 0.05. A. What is the regression equation? Ŷ = __ + ___x B. What is the best predicted value? Ŷ ͌ __ minutes
Statistics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
mathmale
  • mathmale
Have you found a regression equation before? Do you happen to have a TI-84 calculator available to you?
anonymous
  • anonymous
i do have one
mathmale
  • mathmale
Have you used it before to calculate a regresstion line in the form y=ax+b?

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More answers

anonymous
  • anonymous
i am a rookie at it so i have not
mathmale
  • mathmale
Have you previously used the STAT key, which brings up a menu, one of the items on which says EDIT?
anonymous
  • anonymous
yes
mathmale
  • mathmale
If you'd press STAT and then EDIT, your calc will display a couple of columns. would you try that, please? are there numbers in the columns, or are they empty?
anonymous
  • anonymous
im there
anonymous
  • anonymous
there are numbers under L2
mathmale
  • mathmale
If you know how to clear out the numbers in column L2, please do it. Otherwise we may be able to find the regression line without clearing L2.
anonymous
  • anonymous
ok cleared
mathmale
  • mathmale
Here's your data: 96 68 111 80 76 66 91 72 66 58 108 79 116 84 91 79 copy everything from the 1st col. into L1; copy everything from the 2nd col. into L2. Any questions about this, please ask.
anonymous
  • anonymous
done
mathmale
  • mathmale
Now press STAT again. You should see a menu; the middle item at the very top should say MATH or CALC. Does it?
anonymous
  • anonymous
yes
mathmale
  • mathmale
Please move the cursor to cover MATH OR CALC.
anonymous
  • anonymous
ok done
mathmale
  • mathmale
tHEN press the character " 4 ". Your calculator will exevcute option #4, whivch is "linear regressin Line" or something like that.
anonymous
  • anonymous
ok done
mathmale
  • mathmale
Does it display a value for a and a value for b?
anonymous
  • anonymous
yes it does
mathmale
  • mathmale
cool. You're right up there with the best.
mathmale
  • mathmale
what is a? what is b?
anonymous
  • anonymous
well i hit enter and it went to LinReg(ax+b) and thats it
mathmale
  • mathmale
have you pressed ENTER yet?
anonymous
  • anonymous
yes
mathmale
  • mathmale
Has the calc. responded with ifnormation / information?
anonymous
  • anonymous
oh yes it has...i had to hit enter again...it says: y=as+b a= .4601084431 b= 29.82726569
anonymous
  • anonymous
ab not as
mathmale
  • mathmale
What we're hoping for is a screen that gives you... cool. Now write this equation: y=0.461x + 29.827. That is your regression equation.
anonymous
  • anonymous
yay! That was it, now its asking me the next question
mathmale
  • mathmale
This problem asks for the regression equation in slightly different format. It asks that you present b first, and then a. So, to asnwer this quaetion, type in 29.827 for the first blank and 0.461 in the 2nd blank. How
mathmale
  • mathmale
Cool!
mathmale
  • mathmale
Now write down on paper that same regression equation.
anonymous
  • anonymous
thats exciting! lol
mathmale
  • mathmale
type here what the 2nd question asks you for.
anonymous
  • anonymous
ok. What is the best predicted value? Ŷ ͌ __ minutes
mathmale
  • mathmale
Thisis very important: You're going to use the regression equation to PREDICT what the value of y (actually, of "y hat") is when x = 84, was it? Go back to the original question and ascertain the x value.
anonymous
  • anonymous
84
mathmale
  • mathmale
On paper, write the regression equation, subbing 84 for x. Calculate y hat.
anonymous
  • anonymous
ok got it
mathmale
  • mathmale
You're done! My regret is that we don't have time to review this whole problem so that every quantity and concept is clear to you. Hope you'll review our conversation and take notes on it so that you'll be able to do problems like this on your own.
anonymous
  • anonymous
it says 68.551
anonymous
  • anonymous
wow! Thank you so much. I have the others posted but we can do those tomorrow. I REALLY appreciate your help!!
mathmale
  • mathmale
As much as I'd like to continue, it's past my bedtime! Don't know when I'll be available tomorrow, but I do expect to be on then and now. I'm so glad you've gotten this one problem behind you and are feeling better. You're most welcome!
anonymous
  • anonymous
but one more thing: It ask me to round one decimal place so that would be 69, correct?
mathmale
  • mathmale
No, that'd be 68.6. That's to 1 decimal place accuracy.
anonymous
  • anonymous
oh gotcha, ok thanks you again! Gnight!! This really helps. I feel better
mathmale
  • mathmale
Again, I'm so glad! Good night. Bye for now! Over and out.
anonymous
  • anonymous
lol bye

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