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Chapter 12 Test C
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1. Suppose a quality control inspector pulls every tenth can of soup from a conveyor belt to ensure that the cans are filled
to capacity. How should this procedure be evaluated?
a. The sample may not be a random sample.
b. The procedure is defective because it fails to specify which can is selected first.
c. The procedure guarantees that the sample is a random sample.
d. The sample is not large enough for the kind of test being done.
e. The procedure calls for an excessively large sample.
2. A sample that is not representative of the population from which it is drawn is said to be:
a. Compromised.
b. Distorted.
c. Biased.
d. Contaminated.
e. Unresponsive.
3. Suppose that a survey is taken of the adult residents of a town, and one of the questions asked is whether the person
responding graduated from high school. Can the responses to this question be trusted?
a. Yes, because the question is very straightforward.
b. No, because the number of ‘yes’ answers would probably be skewed upward.
c. Yes, because the respondents are adults.
d. No, because the number of ‘yes’ answers would probably be skewed downward.
e. No, because most of the respondents would refuse to answer this question.
4. Suppose two simultaneous random surveys were taken of a mid sized city to determine public acceptance of a proposed
ballot measure. Survey X covered 1000 voters, and Survey Y covered 2000 voters. How would you expect the surveys to
compare for accuracy?
a. There is no way of knowing how the two surveys compare.
b. The two surveys are equally accurate.
c. Survey Y is 4 times more accurate than Survey X.
d. Survey Y is twice as accurate as Survey X
e. Survey Y is probably about one percentage point more accurate than Survey X.
5. Suppose that a biologist took water samples at random intervals from a rapidly flowing creek to test for contaminants.
A sample was taken at a single location from the center of the creek for one year. Could such a survey be depended on?
a. Yes, because contaminants in the creek would not change from day to day.
b. No, because all the samples were taken from the center of the creek.
c. No, because a sample must be taken every day.
d. Probably.
e. No, because all the samples were taken from a single location.
6. Suppose that the average price of a piece of jewelry at Henry’s Jewelers is $200, and Mr. Smith wants to spend
approximately that much for his wife’s birthday gift. Under what circumstances can Mr. Smith be reasonably assured of a
selection of jewelry in his price range?
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Chapter 12 Test C
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a. The average is a mean.
b. The jeweler has a reputation for selling quality merchandise.
c. The average is a modal average.
d. The average is a median.
e. The pieces of jewelry are reasonably priced.
7. One way of exaggerating the apparent message conveyed by a bar graph is by:
a. Altering the vertical scale while leaving the horizontal scale as is.
b. Altering both the horizontal scale and the vertical scale by the same amount.
c. Altering the horizontal scale while leaving the vertical scale as is.
d. Narrowing the width of the bars.
e. Printing the bars in different colors.
8. Range, variance, and standard deviation are measurements of:
a. Gradations of quality.
b. Sampling error.
c. Intensity.
d. Dispersion.
e. Quantity.
9. Suppose that two sets of data conform to a normal probability distribution, and that the standard deviation of Set X is 2,
while the standard deviation of Set Y is 3. Then,
a. Set X contains a larger amount of data than set Y.
b. The curve for Set Y is more flattened and spread out than the curve for Set X.
c. The variance for both sets of data will be the same.
d. The curve for Set X is more flattened and spread out than the curve for Set Y.
e. Set Y contains a larger amount of data than set X.
10. Suppose that the price of crude oil, the primary raw material for gasoline, increases by 30 percent. Assuming
everything else stays the same, by how much has the cost of producing gasoline increased?
a. 35 percent.
b. 32 percent.
c. 30 percent.
d. More than 35 percent.
e. Less than 30 percent.
Data Set 1C
Suppose that the following table represents the age of the houses in a certain neighborhood:
Number of
Houses
Age
2 1
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Chapter 12 Test C
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5 3
1 4
3 6
4 9
11. Given Data Set 1C, what is the mean age of the houses?
a. 3 years.
b. 4.6 years.
c. 5 years.
d. 4 years.
e. 5.7 years.
12. Given Data Set 1C, what is the median age of the houses?
a. 3 years.
b. 5.4 years.
c. 5 years.
d. 4 years.
e. 4.6 years.
13. Given Data Set 1C, what is the modal age of the houses?
a. 3 years.
b. 5 years.
c. 4.3 years.
d. 4 years.
Data Set 2C
Suppose that the lengths of employment (in years) of 7 employees of a small company are as follows:
1, 2, 2, 3, 4, 4, 5
14. What is the approximate variance for Data Set 2C?
a. 1.5
b. 1.7
c. 2
d. 1.6
e. 1.8
15. For Data Set 2C, what is the approximate standard deviation?
a. √1.8
b. 1.1
c. 1.4
d. 2
e. √1.7
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