OSC 2030 Chp 1-4 | 2026/2027 | Correct Answers | With
Complete Solutions
A common rule of thumb for determining how many classes to
use when developing a frequency distribution with classes is:
between 5 and 20 classes.
equal to 0.25 times the number of data values.
at least 10 classes.
no fewer than 6 classes. Correct Answers between 5 and 20
classes
A corporation has 11 manufacturing plants. Of these, 7 are
domestic and 4 are located outside the United States. Each year
a performance evaluation is conducted for 4 randomly selected
plants.What is the probability that a performance evaluation will
contain 3 plants from the United States?
0.3776
0.3523
0.4696
0.4242 Correct Answers 0.4242
A corporation has 11 manufacturing plants. Of these, 7 are
domestic and 4 are located outside the United States. Each year
a performance evaluation is conducted for 4 randomly selected
plants.What is the probability that a performance evaluation will
include 2 or more plants from outside the United States?
0.4696
0.3776
,0.3523
0.4242 Correct Answers 0.4696
A corporation has 11 manufacturing plants. Of these, 7 are
domestic and 4 are located outside the United States. Each year
a performance evaluation is conducted for 4 randomly selected
plants.What is the probability that a performance evaluation will
include exactly 1 plant outside the United States?
0.4696
0.3776
0.4242
0.3523 Correct Answers 0.4242
A distribution has a coefficient of variation of 65 percent and
mean of 74. What is the value of the standard deviation?
4810
113.8
48.1
0.65 Correct Answers 48.1
A distributor of outdoor yard lights has four suppliers. This past
season she purchased 40% of the lights from Franklin Lighting,
30% from Wilson & Sons, 20% from Evergreen Supply, and the
rest from A. L. Scott. In prior years, 3% of Franklin's lights were
defective, 6% of the Wilson lights were defective, 2% of
Evergreen's were defective, and 8% of the Scott lights were
defective. When the lights arrive at the distributor, she puts them
in inventory without identifying the supplier. Suppose that a
,defective light string has been pulled from inventory; what is the
probability that it was supplied by Franklin Lighting?
0.33
0.18
0.29
0.45 Correct Answers 0.29
A histogram can be constructed for data that are either
quantitative or qualitative.
True or False Correct Answers False
A histogram is most commonly used to analyze which of the
following?
Time-series data
Ordinal data
Quantitative data
Nominal level data Correct Answers Quantitative Data
A light bulb manufacturer wants to advertise the average life of
its light bulbs so it tests a subset of light bulbs. This is an
example of inferential statistics.
True or False Correct Answers True
A major insurance company believes that for drivers between 16
years of age and 60 years of age, the number of accidents per
year tends to decrease as age increases. If this is the case, a
, scatter diagram should show a negative relationship between the
two variables.
True or False Correct Answers True
A major retail store has studied customer behavior and found
that the distribution of time customers spend in a store per visit
is symmetric with a mean equal to 17.3 minutes. Based on this
information, which of the following is true?
The median is 17.3 minutes.
The median is to the right of the mean.
The median is to the left of the mean.
The distribution is right-skewed. Correct Answers The median
is 17.3 minutes
A scatter diagram can show whether a pair of variables has a
strong or weak relationship, and also whether it is linear or
curved.
True or False Correct Answers True
A short survey with closed-end questions is likely to have a
better response rate than a long survey with open-ended
questions.
True or False Correct Answers True
A special roulette wheel, which has an equal number of red and
black spots, has come up red four times in a row. Assuming that
the roulette wheel is fair, what concept allows a player to know
Complete Solutions
A common rule of thumb for determining how many classes to
use when developing a frequency distribution with classes is:
between 5 and 20 classes.
equal to 0.25 times the number of data values.
at least 10 classes.
no fewer than 6 classes. Correct Answers between 5 and 20
classes
A corporation has 11 manufacturing plants. Of these, 7 are
domestic and 4 are located outside the United States. Each year
a performance evaluation is conducted for 4 randomly selected
plants.What is the probability that a performance evaluation will
contain 3 plants from the United States?
0.3776
0.3523
0.4696
0.4242 Correct Answers 0.4242
A corporation has 11 manufacturing plants. Of these, 7 are
domestic and 4 are located outside the United States. Each year
a performance evaluation is conducted for 4 randomly selected
plants.What is the probability that a performance evaluation will
include 2 or more plants from outside the United States?
0.4696
0.3776
,0.3523
0.4242 Correct Answers 0.4696
A corporation has 11 manufacturing plants. Of these, 7 are
domestic and 4 are located outside the United States. Each year
a performance evaluation is conducted for 4 randomly selected
plants.What is the probability that a performance evaluation will
include exactly 1 plant outside the United States?
0.4696
0.3776
0.4242
0.3523 Correct Answers 0.4242
A distribution has a coefficient of variation of 65 percent and
mean of 74. What is the value of the standard deviation?
4810
113.8
48.1
0.65 Correct Answers 48.1
A distributor of outdoor yard lights has four suppliers. This past
season she purchased 40% of the lights from Franklin Lighting,
30% from Wilson & Sons, 20% from Evergreen Supply, and the
rest from A. L. Scott. In prior years, 3% of Franklin's lights were
defective, 6% of the Wilson lights were defective, 2% of
Evergreen's were defective, and 8% of the Scott lights were
defective. When the lights arrive at the distributor, she puts them
in inventory without identifying the supplier. Suppose that a
,defective light string has been pulled from inventory; what is the
probability that it was supplied by Franklin Lighting?
0.33
0.18
0.29
0.45 Correct Answers 0.29
A histogram can be constructed for data that are either
quantitative or qualitative.
True or False Correct Answers False
A histogram is most commonly used to analyze which of the
following?
Time-series data
Ordinal data
Quantitative data
Nominal level data Correct Answers Quantitative Data
A light bulb manufacturer wants to advertise the average life of
its light bulbs so it tests a subset of light bulbs. This is an
example of inferential statistics.
True or False Correct Answers True
A major insurance company believes that for drivers between 16
years of age and 60 years of age, the number of accidents per
year tends to decrease as age increases. If this is the case, a
, scatter diagram should show a negative relationship between the
two variables.
True or False Correct Answers True
A major retail store has studied customer behavior and found
that the distribution of time customers spend in a store per visit
is symmetric with a mean equal to 17.3 minutes. Based on this
information, which of the following is true?
The median is 17.3 minutes.
The median is to the right of the mean.
The median is to the left of the mean.
The distribution is right-skewed. Correct Answers The median
is 17.3 minutes
A scatter diagram can show whether a pair of variables has a
strong or weak relationship, and also whether it is linear or
curved.
True or False Correct Answers True
A short survey with closed-end questions is likely to have a
better response rate than a long survey with open-ended
questions.
True or False Correct Answers True
A special roulette wheel, which has an equal number of red and
black spots, has come up red four times in a row. Assuming that
the roulette wheel is fair, what concept allows a player to know
