Statistics for Management and Economics (Book Only)
11th Edition
ISBN: 9781337296946
Author: Gerald Keller
Publisher: Cengage Learning
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Textbook Question
Chapter 1, Problem 3CE
A politician who is running for the office of mayor of a city with 25,000 registered voters commissions a survey. In the survey, 48% of the 200 registered voters interviewed say they plan to vote for her.
- a. What is the population of interest?
- b. What is the sample?
- c. Is the value 48% a parameter or a statistic? Explain.
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The sample data provides that ______ fraction of variations in the life insurance policy is explained by income.
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Twenty different statistics students are randomly selected. For each of them, their body temperature
(°C)
is measured and their head circumference (cm) is measured.
a. For this sample of paired data, what does r represent, and what does
ρ
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b. Without doing any research or calculations, estimate the value of r.
c. Does r change if body temperatures are converted to Fahrenheit degrees?
Question content area bottom
Part 1
a. Choose the correct answer below.
A.
r is a parameter that represents the value of the linear correlation coefficient that would be computed by using all of the paired data in the population of all statistics students, and
ρ
is a statistic that represents the value of the linear correlation coefficient computed from the paired sample data.
B.
r is a statistic that represents the proportion of the variation in head circumference that can be explained by variation in body temperature, and
ρ
is a parameter that represents…
Supposed a study using a random sample of postgraduate students in Sydney found that the average amount of time spent using a mobile phone per day is 5.5 hours.
Indicate whether the quantity described above is a population parameter or a sample statistic, and write down the notation.
Hints:
You may type in how you read the notation, instead of using the symbol itself. E,g. you can write "mu" or "xbar" or "phat" or "rho" or "sigma" for the Greek alphabet or special symbol.
Chapter 1 Solutions
Statistics for Management and Economics (Book Only)
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