MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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A study is performed to explore the relationship, if any, between 24-hour
urinary metabolite 3-methoxy-4-hydroxyphenylglycol (MHPG) levels and
depression in bipolar patients. The MHPG level is measured in micrograms
per 24 hours while the manic-depression (MD) scale used goes from 0
(manic delirium), through 5 (euthymic), up to 10 (depressive stupor). A par-
tial computer printout of regression analysis with MHPG as the independ-
ent variable follows:
Average MHPG = 1243.1 with SD = 384.9
Average MD = 5.4 with SD = 2.875
95% confidence interval for slope b, = (-.0096, -.0016)
%3D
(a) Calculate the slope of the regression line and interpret it in the context
of this problem.
(b) Find the equation of the regression line.
(c) Calculate and interpret the value of r2 in the context of this problem.
(d) What does the correlation say about causation in the context of this
problem.
Transcribed Image Text:1. A study is performed to explore the relationship, if any, between 24-hour urinary metabolite 3-methoxy-4-hydroxyphenylglycol (MHPG) levels and depression in bipolar patients. The MHPG level is measured in micrograms per 24 hours while the manic-depression (MD) scale used goes from 0 (manic delirium), through 5 (euthymic), up to 10 (depressive stupor). A par- tial computer printout of regression analysis with MHPG as the independ- ent variable follows: Average MHPG = 1243.1 with SD = 384.9 Average MD = 5.4 with SD = 2.875 95% confidence interval for slope b, = (-.0096, -.0016) %3D (a) Calculate the slope of the regression line and interpret it in the context of this problem. (b) Find the equation of the regression line. (c) Calculate and interpret the value of r2 in the context of this problem. (d) What does the correlation say about causation in the context of this problem.
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