Intro Stats
4th Edition
ISBN: 9780321826275
Author: Richard D. De Veaux
Publisher: PEARSON
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Chapter 15, Problem 5E
To determine
Check whether it is reasonable for Pew Research to use a Normal model for the sampling distribution of the sample proportion or not.
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ons
12. A sociologist hypothesizes that the crime rate is higher in areas
with higher poverty rate and lower median income. She col-
lects data on the crime rate (crimes per 100,000 residents),
the poverty rate (in %), and the median income (in $1,000s)
from 41 New England cities. A portion of the regression results
is shown in the following table.
Standard
Coefficients
error
t stat
p-value
Intercept
-301.62
549.71
-0.55 0.5864
Poverty
53.16
14.22
3.74 0.0006
Income
4.95
8.26
0.60 0.5526
a.
b.
Are the signs as expected on the slope coefficients?
Predict the crime rate in an area with a poverty rate of
20% and a median income of $50,000.
3. Using data from 50 work
2. The owner of several used-car dealerships believes that the
selling price of a used car can best be predicted using the car's
age. He uses data on the recent selling price (in $) and age of
20 used sedans to estimate Price = Po + B₁Age + ε. A portion
of the regression results is shown in the accompanying table.
Standard
Coefficients
Intercept
21187.94
Error
733.42
t Stat p-value
28.89 1.56E-16
Age
-1208.25
128.95 -9.37
2.41E-08
a. What is the estimate for B₁? Interpret this value.
b. What is the sample regression equation?
C. Predict the selling price of a 5-year-old sedan.
ian income of $50,000.
erty rate of
13. Using data from 50 workers, a researcher estimates Wage =
Bo+B,Education + B₂Experience + B3Age+e, where Wage
is the hourly wage rate and Education, Experience, and Age
are the years of higher education, the years of experience, and
the age of the worker, respectively. A portion of the regression
results is shown in the following table. ni ogolloo bash
1
Standard
Coefficients error
t stat p-value
Intercept
7.87
4.09
1.93
0.0603
Education
1.44
0.34
4.24 0.0001
Experience
0.45
0.14
3.16
0.0028
Age
-0.01
0.08 -0.14 0.8920
a. Interpret the estimated coefficients for Education and
Experience.
b. Predict the hourly wage rate for a 30-year-old worker
with four years of higher education and three years of
experience.
Chapter 15 Solutions
Intro Stats
Ch. 15.2 - You want to poll a random sample of 100 students...Ch. 15.2 - Prob. 2JCCh. 15.2 - If you think that about half the students are in...Ch. 15.5 - Prob. 4JCCh. 15.5 - Prob. 5JCCh. 15.5 - Prob. 6JCCh. 15.5 - Prob. 7JCCh. 15 - Website An investment company is planning to...Ch. 15 - Marketing The proportion of adult women in the...Ch. 15 - Prob. 3E
Ch. 15 - Character recognition An automatic character...Ch. 15 - Prob. 5ECh. 15 - Prob. 6ECh. 15 - Send more money The philanthropic organization in...Ch. 15 - Character recognition, again The automatic...Ch. 15 - Prob. 9ECh. 15 - Prob. 10ECh. 15 - Prob. 11ECh. 15 - Prob. 12ECh. 15 - Prob. 13ECh. 15 - Prob. 14ECh. 15 - Prob. 15ECh. 15 - Prob. 16ECh. 15 - Prob. 17ECh. 15 - Prob. 18ECh. 15 - 19. More coins Suppose the class in Exercise 17...Ch. 15 - 20. Bigger bag Suppose the class in Exercise 18...Ch. 15 - Prob. 21ECh. 15 - Prob. 22ECh. 15 - Prob. 23ECh. 15 - Prob. 24ECh. 15 - Prob. 25ECh. 15 - Prob. 26ECh. 15 - Prob. 27ECh. 15 - Prob. 28ECh. 15 - Prob. 29ECh. 15 - Prob. 30ECh. 15 - Prob. 31ECh. 15 - Prob. 32ECh. 15 - 33. Polling Just before a referendum on a school...Ch. 15 - Prob. 34ECh. 15 - Prob. 36ECh. 15 - Prob. 37ECh. 15 - 38. Meals A restaurateur anticipates serving about...Ch. 15 - Prob. 39ECh. 15 - Prob. 40ECh. 15 - Prob. 41ECh. 15 - CEO compensation The total compensation of the...Ch. 15 - Prob. 43ECh. 15 - Prob. 44ECh. 15 - GPAs A colleges data about the incoming freshmen...Ch. 15 - Prob. 46ECh. 15 - Lucky spot? A reporter working on a story about...Ch. 15 - Prob. 48ECh. 15 - Pregnancy Assume that the duration of human...Ch. 15 - Rainfall Statistics from Cornells Northeast...Ch. 15 - Prob. 51ECh. 15 - Prob. 52ECh. 15 - Prob. 53ECh. 15 - Prob. 54ECh. 15 - 55. AP Stats 2011 The College Board reported the...Ch. 15 - Prob. 56ECh. 15 - Prob. 57ECh. 15 - Prob. 58ECh. 15 - Prob. 59ECh. 15 - 60. Potato chips The weight of potato chips in a...Ch. 15 - Prob. 61ECh. 15 - 62. Milk Although most of us buy milk by the quart...
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