STRAIGHTERLINE BUSINESS STATS
FINAL EXAM QUESTIONS AND
ANSWERS
The main purpose of descriptive statistics is to - Correct Answers -Summarize data in a
useful and informative manner
Which word is NOT part of the definition of descriptive statistics? - Correct Answers -
Predicting
A marketing class of 50 students evaluated the instructor using the following scale:
superior, good, average, poor, and inferior. The descriptive summary showed the
following survey results: 2% superior, 8% good, 45% average, 45% poor, and 0%
inferior. - Correct Answers -c. Most students rated the instructor as poor or average.
What type of variable is the number of robberies reported in your city? - Correct
Answers -Quantitative
The Nielsen Ratings break down the number of people watching a particular television
show by age. What level of measurement is age? - Correct Answers -Ratio
What level of measurement is a person's "favorite sport"? - Correct Answers -Nominal
The final rankings of the top 20 NCAA college basketball teams are an example of
which level of measurement? - Correct Answers -Ordinal
What level of measurement is the Centigrade temperature scale? - Correct Answers -
Interval
A survey includes a question regarding marital status that has the following responses:
single, married, divorced, separated, or widowed. What is the scale of measurement for
this question? - Correct Answers -Nominal
A group of women tried five brands of fingernail polish and ranked them according to
preference. What level of measurement is this? - Correct Answers -Ordinal
Shoe style is an example of what level of measurement? - Correct Answers -Nominal
When TV advertisements report "2 out of 3 dentists surveyed indicated they would
recommend Brand X toothpaste to their patients," an informed consumer may question
,the conclusion because the: - Correct Answers -Advertisement does not include the
total number of dentists surveyed
A sample of the paramedical fees charged by clinics revealed these amounts: $55, $49,
$50, $45, $52, and $55. What is the median charge? - Correct Answers -51.00
For a data set with an odd number of observations that have been sorted from smallest
to largest values, where is the median located? - Correct Answers -(n + 1)/2
Assume a student received the following grades for the semester: History, B; Statistics,
A; Spanish, C; and English, C. History and English are 5 credit-hour courses, Statistics
a 4 credit-hour course, and Spanish a 3 credit-hour course. If 4 grade points are
assigned for an A, 3 for a B, and 2 for a C, what is the weighted mean grade for the
semester? - Correct Answers -2.76
A disadvantage of using an arithmetic mean to summarize a set of data is that
__________. - Correct Answers -It can be biased by one or two extremely small or large
values
A survey item asked students to indicate their class in college: freshman, sophomore,
junior, or senior. Which measure(s) of central location would be appropriate for the data
generated by that questionnaire item? - Correct Answers -Mode and median
The times (in minutes) that several underwriters took to review applications for similar
insurance coverage are 50, 230, 52, and 57. What is the median length of time required
to review an application? - Correct Answers -54.5
For the most recent seven years, the U.S. Department of Education reported the
following number of bachelor's degrees awarded in computer science: 4,033; 5,652;
6,407; 7,201; 8,719; 11,154; 15,121. What is the annual arithmetic mean number of
degrees awarded? - Correct Answers -About 8,327
Which of the following measures of dispersion are based on deviations from the mean?
- Correct Answers -All apply
From the easiest to the hardest "ease of interpretation," rank the measures of
dispersion. - Correct Answers -Range, mean deviation, variance
The weights of a sample of crates ready for shipment to Moscow, Russia are (in
kilograms): 103, 97, 101, 106, and 103. What is the mean deviation? - Correct Answers
-2.4 kg
A sample of assistant professors on the business faculty at state-supported institutions
in Ohio revealed the mean income to be $72,000 for nine months, with a standard
deviation of $3,000. Using Chebyshev's Theorem, what proportion of the faculty earns
more than $66,000, but less than $78,000? - Correct Answers -At least 75%
, Based on the Empirical Rule, what percent of the observations will lie between plus or
minus two standard deviations from the mean? - Correct Answers -95%
What is the relationship between the variance and the standard deviation? - Correct
Answers -Variance is the square of the standard deviation.
What statistics are needed to draw a box plot? - Correct Answers -The minimum,
maximum, median, first and third quartiles
A box plot shows ___________. - Correct Answers -The relative symmetry of a
distribution for a set of data
A dot plot can be used to show _________________. - Correct Answers -The
distribution for a quantitative variable
If a student places in the 99th percentile on an exam, she performed better than 99% of
all students who completed the exam. Her performance is similar to a statement based
on a __________. - Correct Answers -Cumulative frequency distribution
To locate the percentile for a given observation in a data set, the data must be
___________. - Correct Answers -Sorted and listed from the minimum to the maximum
values
The test scores for a class of 147 students are computed. What is the location of the
test score associated with the third quartile? - Correct Answers -111
In a distribution, the second quartile corresponds with the __________. - Correct
Answers -Median
A dot plot shows ____________. - Correct Answers -The general shape of a distribution
The range of the coefficient of skewness is ____________. - Correct Answers -Both
positive and negative values
A sample of experienced typists revealed that their mean typing speed is 87 words per
minute and the median typing speed is 73 words per minute. The standard deviation of
typing speed is 16.9 words per minute. What is the Pearson coefficient of skewness? -
Correct Answers -+2.5
If the coefficient of skewness is equal to zero, the shape of the distribution is
__________. - Correct Answers -Symmetric
A large oil company is studying the number of gallons of gasoline purchased per
customer at self-service pumps. The mean number of gallons is 10.0, with a standard
FINAL EXAM QUESTIONS AND
ANSWERS
The main purpose of descriptive statistics is to - Correct Answers -Summarize data in a
useful and informative manner
Which word is NOT part of the definition of descriptive statistics? - Correct Answers -
Predicting
A marketing class of 50 students evaluated the instructor using the following scale:
superior, good, average, poor, and inferior. The descriptive summary showed the
following survey results: 2% superior, 8% good, 45% average, 45% poor, and 0%
inferior. - Correct Answers -c. Most students rated the instructor as poor or average.
What type of variable is the number of robberies reported in your city? - Correct
Answers -Quantitative
The Nielsen Ratings break down the number of people watching a particular television
show by age. What level of measurement is age? - Correct Answers -Ratio
What level of measurement is a person's "favorite sport"? - Correct Answers -Nominal
The final rankings of the top 20 NCAA college basketball teams are an example of
which level of measurement? - Correct Answers -Ordinal
What level of measurement is the Centigrade temperature scale? - Correct Answers -
Interval
A survey includes a question regarding marital status that has the following responses:
single, married, divorced, separated, or widowed. What is the scale of measurement for
this question? - Correct Answers -Nominal
A group of women tried five brands of fingernail polish and ranked them according to
preference. What level of measurement is this? - Correct Answers -Ordinal
Shoe style is an example of what level of measurement? - Correct Answers -Nominal
When TV advertisements report "2 out of 3 dentists surveyed indicated they would
recommend Brand X toothpaste to their patients," an informed consumer may question
,the conclusion because the: - Correct Answers -Advertisement does not include the
total number of dentists surveyed
A sample of the paramedical fees charged by clinics revealed these amounts: $55, $49,
$50, $45, $52, and $55. What is the median charge? - Correct Answers -51.00
For a data set with an odd number of observations that have been sorted from smallest
to largest values, where is the median located? - Correct Answers -(n + 1)/2
Assume a student received the following grades for the semester: History, B; Statistics,
A; Spanish, C; and English, C. History and English are 5 credit-hour courses, Statistics
a 4 credit-hour course, and Spanish a 3 credit-hour course. If 4 grade points are
assigned for an A, 3 for a B, and 2 for a C, what is the weighted mean grade for the
semester? - Correct Answers -2.76
A disadvantage of using an arithmetic mean to summarize a set of data is that
__________. - Correct Answers -It can be biased by one or two extremely small or large
values
A survey item asked students to indicate their class in college: freshman, sophomore,
junior, or senior. Which measure(s) of central location would be appropriate for the data
generated by that questionnaire item? - Correct Answers -Mode and median
The times (in minutes) that several underwriters took to review applications for similar
insurance coverage are 50, 230, 52, and 57. What is the median length of time required
to review an application? - Correct Answers -54.5
For the most recent seven years, the U.S. Department of Education reported the
following number of bachelor's degrees awarded in computer science: 4,033; 5,652;
6,407; 7,201; 8,719; 11,154; 15,121. What is the annual arithmetic mean number of
degrees awarded? - Correct Answers -About 8,327
Which of the following measures of dispersion are based on deviations from the mean?
- Correct Answers -All apply
From the easiest to the hardest "ease of interpretation," rank the measures of
dispersion. - Correct Answers -Range, mean deviation, variance
The weights of a sample of crates ready for shipment to Moscow, Russia are (in
kilograms): 103, 97, 101, 106, and 103. What is the mean deviation? - Correct Answers
-2.4 kg
A sample of assistant professors on the business faculty at state-supported institutions
in Ohio revealed the mean income to be $72,000 for nine months, with a standard
deviation of $3,000. Using Chebyshev's Theorem, what proportion of the faculty earns
more than $66,000, but less than $78,000? - Correct Answers -At least 75%
, Based on the Empirical Rule, what percent of the observations will lie between plus or
minus two standard deviations from the mean? - Correct Answers -95%
What is the relationship between the variance and the standard deviation? - Correct
Answers -Variance is the square of the standard deviation.
What statistics are needed to draw a box plot? - Correct Answers -The minimum,
maximum, median, first and third quartiles
A box plot shows ___________. - Correct Answers -The relative symmetry of a
distribution for a set of data
A dot plot can be used to show _________________. - Correct Answers -The
distribution for a quantitative variable
If a student places in the 99th percentile on an exam, she performed better than 99% of
all students who completed the exam. Her performance is similar to a statement based
on a __________. - Correct Answers -Cumulative frequency distribution
To locate the percentile for a given observation in a data set, the data must be
___________. - Correct Answers -Sorted and listed from the minimum to the maximum
values
The test scores for a class of 147 students are computed. What is the location of the
test score associated with the third quartile? - Correct Answers -111
In a distribution, the second quartile corresponds with the __________. - Correct
Answers -Median
A dot plot shows ____________. - Correct Answers -The general shape of a distribution
The range of the coefficient of skewness is ____________. - Correct Answers -Both
positive and negative values
A sample of experienced typists revealed that their mean typing speed is 87 words per
minute and the median typing speed is 73 words per minute. The standard deviation of
typing speed is 16.9 words per minute. What is the Pearson coefficient of skewness? -
Correct Answers -+2.5
If the coefficient of skewness is equal to zero, the shape of the distribution is
__________. - Correct Answers -Symmetric
A large oil company is studying the number of gallons of gasoline purchased per
customer at self-service pumps. The mean number of gallons is 10.0, with a standard
