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Chapter 12 Test B
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1. Suppose a poll is taken to sample voter preferences in an upcoming presidential election. To conduct the poll, an
interviewer standing on a street corner in the financial district of a large city asks questions of people as they pass by.
What result would be expected from such a poll?
a. The people on the street corner would refuse to speak to the interviewer.
b. The people interviewed would not be candid with their answers.
c. The responses would be biased in favor of the Democratic candidate.
d. The responses would be biased in favor of the Republican candidate.
e. The responses would accurately predict the outcome of the election.
2. Suppose that a poll is taken about how marriage partners relate to each other, and one of the questions asked is if the
person being interviewed has ever lied to his/her spouse. Can the responses to this question be trusted?
a. Yes, because the question is very straightforward.
b. Yes, because most people are inclined to answer truthfully in a poll.
c. No, because people who have lied to their spouse would probably deny it.
d. No, because the question is ambiguous.
e. Yes, because the vast majority of marriage partners do not lie to their spouse.
3. One of the problems with the Literary Digest poll taken prior to the 1936 presidential election was:
a. Many of the people in the population could not afford a telephone.
b. The sample size was too small.
c. The population was too large.
d. The responses were biased because of the way the questions were phrased.
e. Most people were not at home at the time the calls were made.
4. In general, the larger a sample is:
a. The smaller the standard deviation becomes.
b. The more likely it is that it will be biased.
c. The more difficult it becomes to avoid atypical cases.
d. The greater the standard deviation becomes.
e. The more closely it represents the population.
5. In a normal distribution, the data represented are:
a. Skewed away from the median point.
b. Skewed toward the mean point.
c. Random.
d. Trustworthy.
e. Shaped like a triangle.
6. One way of exaggerating fluctuations in the price of a company’s stock is to:
a. Contract the horizontal scale.
b. Chop off the bottom of the graph and expand the vertical scale.
c. Chop off the top of the graph and expand the horizontal scale.
d. Use a thicker line to represent the fluctuations.
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Chapter 12 Test B
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e. Alter the background color of the graph.
7. Suppose that you want to buy a pair of size 9 shoes, and you are told that the average size of the shoes in Bob’s Shoe
Store are size 9. Under what circumstances is this information useful to you?
a. The shoes reflect the latest fashions.
b. The standard deviation is relatively large.
c. The average is a mean.
d. The average is a modal average.
e. The average is a median.
8. If the standard deviation of a set of data is relatively small, then:
a. The sample does not accurately represent the population.
b. The standard deviation diverges from the variance.
c. The data tend to be spread out from the median point.
d. The population from which the data are extracted tends to be large.
e. Most of the data fall close to the mean point.
9. Suppose that the costs of operating a certain restaurant increase by the following amounts: food: 4%, labor: 5%,
electricity: 3%, taxes: 2%, repairs and maintenance: 4%. By how much have the costs of operating the restaurant
increased?
a. 18%
b. Less than 5%.
c. The modal average of the increases for these five items.
d. Less than 2%.
e. More than 18%.
10. Suppose that for a large population, the margin of error of Poll A is 2%, and the margin of error of Poll B is 4%. Then,
a. The sample used in Poll A is much larger than the sample used in Poll B.
b. The sample used in Poll A is slightly larger than the sample used in Poll B.
c. The sample used in Poll B is much larger than the sample used in Poll A.
d. The sample used in Poll B is slightly larger than the sample used in Poll A.
e. The difference in sampling error is unrelated to the size of the samples.
Data Set 1B
Suppose that the following table represents the age of the cars in a small used car lot:
Number of
Cars
Age
2 1
4 2
1 3
5 4
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Chapter 12 Test B
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11. Given Data Set 1B, what is the mean age of the cars?
a. 2 years.
b. 2.5 years.
c. 3 years.
d. 4 years.
e. 3.5 years.
12. Given Data Set 1B, what is the median age of the cars?
a. 4 years.
b. 3.5 years.
c. 5 years.
d. 3 years.
e. 6 years.
13. Given Data Set 1B, what is the modal age of the cars?
a. 5 years.
b. 4 years.
c. 6 years.
d. 3 years.
Data Set 2B
Suppose that the height (in meters) of 6 fir trees in the garden department of a store are as follows:
1, 2, 2, 4, 4, 5
14. What is the variance for Data Set 2B?
a. √2
b. 1.5
c. 2.5
d. 1
e. 2
15. For Data Set 2B, what is the standard deviation?
a. √2
b. 1
c. 1.3
d. 2
e. √1.5