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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

Brain size Does your IQ depend on the size of your
brain? A group of female college students took a test that
measured their verbal IQs and also underwent an MRI

scan to measure the size of their brains (in 1000s of pix-
els). The scatterplot and regression analysis are shown,

and the assumptions for inference were satisfied.Dependent variable is: IQ_Verbal
R-squared = 6.5% s = 21.5291 df = 18
Variable Coefficient SE(Coeff)
Intercept 24.1835 76.38
Size 0.098842 0.0884
a) Test an appropriate hypothesis about the association
between brain size and IQ.
b) State your conclusion about the strength of this
association.

120
100
80
800
850
900
950
Brain Size (1000 pixels)
Verbal IQ

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