January 26, 2015

Homework Help: Precalculus / Statistics

Posted by Ryan St. Laurent on Thursday, May 24, 2007 at 7:34pm.

I have a question about residual plots and regression equations.

The data is:

1 6.1
2 5.5
3 9.8
4 10.6
5 14.2
6 21.5
7 29.9
8 37.2
9 50.6
10 64
11 77.6

What function fits this data the best, between Exponential, Linear, Quadratic, and Power.
Also how do you make residual plots on a TI-83 Graphing Calculator?

Thank you so much for your help in advance. This is crucial to my grade.

First, graph it out. what does the graph look like. not straight so toss out Linear. Constantly rising (no humps), so (probably) toss out quadratic. Could be a power function, but offhand id say it was an exponential function (in that the function seems to be growing by e^(ax))

So, next take the natural log of your y values, and graph that. I get something resembling a straight line. Estimate an OLS regression on the logged values. Plot the predicted from the regression, and actual values; the difference between the two are the residuals (which could easily be plotted).

Answer this Question

First Name:
School Subject:

Related Questions

statistics - Which of the following is not a consideration in determining the ...
Statistics - We're doing a project. I have all my data, but I'm not sure about ...
STATISTICS - The following data represents the monthly natural gas consumption (...
Statistics - The residual sum of the squares is the numerator portion of the ...
Statistics - The residual sum of the squares is the numerator portion of the ...
Precalculus - Question Details: Finding Regression for each set of data & ...
statistics - Pre study scores versus post-study scores for a class of 120 ...
Statistics - Is is possible for the regression equation to have none of the ...
Reply to grant about a regression problem - This is a reply to the question ...
statistics - Job Sat. INTR. EXTR. Benefits 5.2 5.5 6.8 1.4 5.1 5.5 5.5 5.4 5.8 5...