MATLAB: An Introduction with Applications, 6th Edition: An Introduction with Applications
6th Edition
ISBN: 9781119385134
Author: Amos Gilat
Publisher: WILEY
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Chapter 5, Problem 7P
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3. Bayesian Inference – Updating Beliefs
A medical test for a rare disease has the following characteristics:
Sensitivity (true positive rate): 99%
Specificity (true negative rate): 98%
The disease occurs in 0.5% of the population.
A patient receives a positive test result.
Questions:
a) Define the relevant events and use Bayes’ Theorem to compute the probability that the patient actually has the disease.b) Explain why the result might seem counterintuitive, despite the high sensitivity and specificity.c) Discuss how prior probabilities influence posterior beliefs in Bayesian inference.d) Suppose a second, independent test with the same accuracy is conducted and is also positive. Update the probability that the patient has the disease.
4. Linear Regression - Model Assumptions and Interpretation
A real estate analyst is studying how house prices (Y) are related to house size in square feet (X). A simple
linear regression model is proposed:
The analyst fits the model and obtains:
•
Ŷ50,000+150X
YBoB₁X + €
•
R² = 0.76
• Residuals show a fan-shaped pattern when plotted against fitted values.
Questions:
a) Interpret the slope coefficient in context.
b) Explain what the R² value tells us about the model's performance.
c) Based on the residual pattern, what regression assumption is likely violated? What might be the
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d) Suggest at least two remedies to improve the model, based on the residual analysis.
Chapter 5 Solutions
MATLAB: An Introduction with Applications, 6th Edition: An Introduction with Applications
Ch. 5 - Prob. 1PCh. 5 - Use the plot command to plot the function...Ch. 5 - Use the plot command to plot the function...Ch. 5 - Plot the function (x)=x2exand its derivative for...Ch. 5 - Make two separate plots of the function...Ch. 5 - Use the fplot command to plot the funtion...Ch. 5 - Plot the function f(x) = sin(2x) cos2(0.5x) and...Ch. 5 - The orbit of the planet Mercury around the sun can...Ch. 5 - Prob. 9PCh. 5 - The butterfly curve (Fay. T. H. “The Butterfly...
Ch. 5 - A plot of an astroid is shown in the figure on the...Ch. 5 - Make the plot of the astroid that is shown in the...Ch. 5 - Plot the function f(x)=x26x+7x38 in the domain 0x4...Ch. 5 - Plot the function f(x)=x+1x21 for 4x4 . Notice...Ch. 5 - Prob. 15PCh. 5 - The shape of the pretzel shown is given by the...Ch. 5 - Prob. 17PCh. 5 - Make a polar of the function: =n135.7 r=n for n=1,...Ch. 5 - Prob. 19PCh. 5 - Plot two ellipses is one figure (shown). The...Ch. 5 - The following data gives the height (in inches) of...Ch. 5 - The volage Vc t second after closing the switch in...Ch. 5 - The force F (in N) acting between a particle with...Ch. 5 - The curvilinear motion of a particle is defined by...Ch. 5 - The height and speed of a projectile shoot at a...Ch. 5 - The position x as a function of time of a particle...Ch. 5 - According to Planck’s law of black- body...Ch. 5 - A high-pass filter passes signals with frequencies...Ch. 5 - A resistor, R = 4O, and an inductor, L = 1.3 H,...Ch. 5 - In a typical tension test a dog-bone shaped...Ch. 5 - According to special relativity, a rod of length L...Ch. 5 - A railroad bumper is designed to slow down a...Ch. 5 - The ideal gas equation states that PVRT=n, where P...Ch. 5 - Two sound waves of slightly different frequencies...Ch. 5 - Consider the diode circuit shown in the figure....Ch. 5 - A monochromatic light that passes through a double...Ch. 5 - A simply supported beam is loaded as shown. The...Ch. 5 - Biological oxygen demand (BOD) is a measure of the...Ch. 5 - The shape of a asymmetric four-digitseries NACA...Ch. 5 - The Taylor series expansion for sin2x is:...
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