EBK MATLAB: AN INTRODUCTION WITH APPLIC
6th Edition
ISBN: 8220103113663
Author: GILAT
Publisher: YUZU
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Chapter 1, Problem 28P
The number of permutations nProf taking r Objects out of n objects without repetition is given by:
(a) Determine how many six-letter passwords can be formed from the 26 letters in the English alphabet if a letter can only be used once.
(b) How many passwords can be formed if the digits 0. 1, 2,…, 9 can be used in addition to the letters.
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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
consequence?
d) Suggest at least two remedies to improve the model, based on the residual analysis.
5. Probability Distributions – Continuous Random Variables
A factory machine produces metal rods whose lengths (in cm) follow a continuous uniform distribution on the interval [98, 102].
Questions:
a) Define the probability density function (PDF) of the rod length.b) Calculate the probability that a randomly selected rod is shorter than 99 cm.c) Determine the expected value and variance of rod lengths.d) If a sample of 25 rods is selected, what is the probability that their average length is between 99.5 cm and 100.5 cm? Justify your answer using the appropriate distribution.
Chapter 1 Solutions
EBK MATLAB: AN INTRODUCTION WITH APPLIC
Ch. 1 - Prob. 1PCh. 1 - Calculate: (a) 8+802.6+e3.53 (b)...Ch. 1 - Calculate: (a) 23+453160.7+log10589006 (b)...Ch. 1 - Calculate: (a) 3.822.754125+5.2+1.853.5 (b)...Ch. 1 - Calculate: (a)sin0.2cos/6+tan72 (b)...Ch. 1 - Define the varialbe z as z = 4.5; than evaluate:...Ch. 1 - Define the variable t as t= 3.2; then evalute: (a)...Ch. 1 - Define the variable xandy as x = 6.5 and y = 3.8;...Ch. 1 - Define the variables a, b, c, and d as: c= 4.6, d...Ch. 1 - Two trigonometric identities are given by: (a)...
Ch. 1 - Two trigonometric identities are given by: (a)...Ch. 1 - Define two variables: alpha =8, and beta = 6....Ch. 1 - Given: x2cosxdx=2xcosx+x22sinx . Use MATLAB to...Ch. 1 - A rectangular box has the dimensions shown. (a)...Ch. 1 - The are length of a segment of a parabola ABC is...Ch. 1 - The three shown circles, with radius 15 in., 10.5...Ch. 1 - A frustum of cone is filled with ice cream such...Ch. 1 - 18. In the triangle shown a =27 in., b 43 in.,...Ch. 1 - For the triangle shown, a = 72°, ß=43°, and its...Ch. 1 - The distance d from a point P (xp,yp,zp) to the...Ch. 1 - The perimeter of an ellipse can be approximated...Ch. 1 - A total of 4217 eggs have w be packed in boxes...Ch. 1 - A total of 777 people have to be transported using...Ch. 1 - Change the display to format long g. Assign the...Ch. 1 - The voltage difference Vabbetween points a and b...Ch. 1 - The current in a series RCL circuit is given by:...Ch. 1 - The monthly payment M of a mortgage P for n years...Ch. 1 - The number of permutations nProf taking r Objects...Ch. 1 - The number of combinations Cn,r of taking r...Ch. 1 - The equivalent resistance of two resistors R1and...Ch. 1 - The output voltage Voutin the circuit shown is...Ch. 1 - Radioactive decay of carbon-14 is used for...Ch. 1 - The greatest common divisor is the largest...Ch. 1 - The amount of energy E (in joules) that is...Ch. 1 - According to the Doppler effect of light, the...Ch. 1 - Newton’s law of cooling gives the temperature T(t)...Ch. 1 - The velocity v and the falling distance d as a...Ch. 1 - Use the Help Window to find a display format that...Ch. 1 - Gosper’s approximation for factorials is given by:...Ch. 1 - According to Newton’s law of universal...
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