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StClowers
Group Title
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
 8 months ago
 8 months ago
StClowers Group Title
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
 8 months ago
 8 months ago

This Question is Closed

mathmale Group TitleBest ResponseYou've already chosen the best response.1
Have you found a regression equation before? Do you happen to have a TI84 calculator available to you?
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
i do have one
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
Have you used it before to calculate a regresstion line in the form y=ax+b?
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
i am a rookie at it so i have not
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
Have you previously used the STAT key, which brings up a menu, one of the items on which says EDIT?
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
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?
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
im there
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
there are numbers under L2
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
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.
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
ok cleared
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
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.
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
Now press STAT again. You should see a menu; the middle item at the very top should say MATH or CALC. Does it?
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
Please move the cursor to cover MATH OR CALC.
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
tHEN press the character " 4 ". Your calculator will exevcute option #4, whivch is "linear regressin Line" or something like that.
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
Does it display a value for a and a value for b?
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
yes it does
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
cool. You're right up there with the best.
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
what is a? what is b?
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
well i hit enter and it went to LinReg(ax+b) and thats it
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
have you pressed ENTER yet?
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
Has the calc. responded with ifnormation / information?
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
oh yes it has...i had to hit enter again...it says: y=as+b a= .4601084431 b= 29.82726569
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
ab not as
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
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.
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
yay! That was it, now its asking me the next question
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
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
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
Now write down on paper that same regression equation.
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
thats exciting! lol
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
type here what the 2nd question asks you for.
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
ok. What is the best predicted value? Ŷ ͌ __ minutes
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
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.
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
On paper, write the regression equation, subbing 84 for x. Calculate y hat.
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
ok got it
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
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.
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
it says 68.551
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
wow! Thank you so much. I have the others posted but we can do those tomorrow. I REALLY appreciate your help!!
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
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!
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
but one more thing: It ask me to round one decimal place so that would be 69, correct?
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
No, that'd be 68.6. That's to 1 decimal place accuracy.
 8 months ago

StClowers Group TitleBest ResponseYou've already chosen the best response.0
oh gotcha, ok thanks you again! Gnight!! This really helps. I feel better
 8 months ago

mathmale Group TitleBest ResponseYou've already chosen the best response.1
Again, I'm so glad! Good night. Bye for now! Over and out.
 8 months ago
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