200 150 100 - 8 10 12 Interest Amount

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Interest rates and mortgages again In Chapter 6,
Exercise 33, we saw a plot of mortgages in the United
States (in thousands of dollars) versus the interest rate at
various times over the past 26 years. The correlation is
r = -0.86. The mean mortgage amount is $121.8 thou-
sand and the mean interest rate is 7.74%. The standard
deviations are $47.36 thousand for mortgage amounts
and 1.79% for the interest rates.
a) Is a regression model appropriate for predicting mort-
gage amount from interest rates? Explain.
b) What is the equation that predicts mortgage amount
from interest rates?
c) What would you predict the mortgage amount would
be if the interest rates climbed to 13%?
d) Do you have any reservations about your prediction in
part c)?
e) If we standardized both variables, what would be the
regression equation that predicts standardized mort-
gage amount from standardized interest rates?
f) If we standardized both variables, what would be the
regression equation that predicts standardized interest
rates from standardized mortgage amount?
200
150
100 -
8
10
12
Interest
Amount
Transcribed Image Text:200 150 100 - 8 10 12 Interest Amount
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