Essential Statistics 3rd Edition

Essential Statistics 3rd Edition Navidi TEST BANK




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,MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) To study the effect of air pollution on respiratory health, a group of people in a city with 1)
high levels of air pollution and another group in a rural area with low levels of pollution
are examined to determine their lung capacity. Is this a randomized experiment or an
observational study?
A) randomized experiment B) observational study
Answer: B

2) Choose the answer below that best completes the following statement. 2)

A _________is a number that describes a population.
A) sample B) statistic C) summary D) parameter
Answer: D

3) A ________ is a subset of a population. 3)
A) simple random sample B) sample
C) cluster D) sample of convenience
Answer: B

4) An experiment that tends to overestimate or underestimate the true value is said to be 4)
______________.
A) biased B) flagrant
C) randomized D) un-randomized
Answer: A

5) In a ________ experiment, subjects do not decide for themselves which treatment they 5)
will get.
A) prospective B) observational C) randomized D) double-blind
Answer: C

TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.

6) Determine whether the statement is true or false. 6)
In a case-control study, the outcome has occurred before the subjects are sampled.
Answer: True False

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

7) Is the following variable at the interval or the ratio level of measurement? 7)
Your age in years
A) Interval B) Ratio
Answer: B




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, 8) An electronics manufacturer test every 500th cell phone to verify that it is functioning 8)
properly. Identify the kind of sample that is being used.
A) cluster sample B) simple random sample
C) stratified sample D) systematic sample
Answer: D

9) The entire collection of individuals about which information is sought is called a 9)
________.
A) population B) simple random sample
C) sample D) cluster
Answer: A

10) People are reluctant to admit to behavior that may reflect negatively on them. This can 10)
lead to ...
A) sampling bias B) voluntary response bias
C) hurt feelings D) social acceptability bias
Answer: D

11) Is the following variable at the interval or the ratio level of measurement? 11)
The year of your birth
A) Interval B) Ratio
Answer: A

12) A medical researcher wants to determine whether exercising can lower blood pressure. 12)
At a health fair, he measures the blood pressure of 100 individuals and interviews them
about their exercise habits. He divides the individuals into two categories: those whose
typical level of exercise is low, and those whose level of exercise is high. Is this a
randomized experiment or an observational study?
A) Observational study B) Randomized experiment
Answer: A

13) A pollster randomly samples 163 Democrats, 144 Republicans and 15 Independents (all
13)
registered voters) in Metro City and asks each poll participant which mayorial candidate
he or she prefers. Identify the kind of sample that the pollster is using.
A) sample of convenience B) voluntary response sample
C) stratified sample D) cluster sample
Answer: C

14) A pollster wants to estimate the proportion of voters in a certain town who are
14)
Democrats. He goes to a large shopping mall and approaches people to ask whether they
are Democrats. Is this a simple random sample?
A) yes B) no
Answer: B




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