Straighterline Business Stats Final
The main purpose of descriptive statistics is to - ✔✔ correct answer Summarize data in a useful and
informative manner
Which word is NOT part of the definition of descriptive statistics? - ✔✔ correct answer 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 answer c. Most students
rated the instructor as poor or average.
What type of variable is the number of robberies reported in your city? - ✔✔ correct answer
Quantitative
The Nielsen Ratings break down the number of people watching a particular television show by age.
What level of measurement is age? - ✔✔ correct answer Ratio
What level of measurement is a person's "favorite sport"? - ✔✔ correct answer Nominal
The final rankings of the top 20 NCAA college basketball teams are an example of which level of
measurement? - ✔✔ correct answer Ordinal
What level of measurement is the Centigrade temperature scale? - ✔✔ correct answer 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 answer Nominal
A group of women tried five brands of fingernail polish and ranked them according to preference.
What level of measurement is this? - ✔✔ correct answer Ordinal
Shoe style is an example of what level of measurement? - ✔✔ correct answer 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 answer Advertisement does not include the total number of dentists surveyed
,Straighterline Business Stats Final
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 answer 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 answer (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 answer 2.76
A disadvantage of using an arithmetic mean to summarize a set of data is that __________. - ✔✔
correct answer 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 answer 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 answer 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 answer About 8,327
Which of the following measures of dispersion are based on deviations from the mean? - ✔✔ correct
answer All apply
From the easiest to the hardest "ease of interpretation," rank the measures of dispersion. - ✔✔
correct answer 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 answer 2.4 kg
, Straighterline Business Stats Final
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 answer 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 answer 95%
What is the relationship between the variance and the standard deviation? - ✔✔ correct answer
Variance is the square of the standard deviation.
What statistics are needed to draw a box plot? - ✔✔ correct answer The minimum, maximum,
median, first and third quartiles
A box plot shows ___________. - ✔✔ correct answer The relative symmetry of a distribution for a
set of data
A dot plot can be used to show _________________. - ✔✔ correct answer 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 answer Cumulative frequency distribution
To locate the percentile for a given observation in a data set, the data must be ___________. - ✔✔
correct answer 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 answer 111
In a distribution, the second quartile corresponds with the __________. - ✔✔ correct answer
Median
A dot plot shows ____________. - ✔✔ correct answer The general shape of a distribution
The main purpose of descriptive statistics is to - ✔✔ correct answer Summarize data in a useful and
informative manner
Which word is NOT part of the definition of descriptive statistics? - ✔✔ correct answer 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 answer c. Most students
rated the instructor as poor or average.
What type of variable is the number of robberies reported in your city? - ✔✔ correct answer
Quantitative
The Nielsen Ratings break down the number of people watching a particular television show by age.
What level of measurement is age? - ✔✔ correct answer Ratio
What level of measurement is a person's "favorite sport"? - ✔✔ correct answer Nominal
The final rankings of the top 20 NCAA college basketball teams are an example of which level of
measurement? - ✔✔ correct answer Ordinal
What level of measurement is the Centigrade temperature scale? - ✔✔ correct answer 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 answer Nominal
A group of women tried five brands of fingernail polish and ranked them according to preference.
What level of measurement is this? - ✔✔ correct answer Ordinal
Shoe style is an example of what level of measurement? - ✔✔ correct answer 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 answer Advertisement does not include the total number of dentists surveyed
,Straighterline Business Stats Final
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 answer 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 answer (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 answer 2.76
A disadvantage of using an arithmetic mean to summarize a set of data is that __________. - ✔✔
correct answer 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 answer 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 answer 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 answer About 8,327
Which of the following measures of dispersion are based on deviations from the mean? - ✔✔ correct
answer All apply
From the easiest to the hardest "ease of interpretation," rank the measures of dispersion. - ✔✔
correct answer 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 answer 2.4 kg
, Straighterline Business Stats Final
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 answer 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 answer 95%
What is the relationship between the variance and the standard deviation? - ✔✔ correct answer
Variance is the square of the standard deviation.
What statistics are needed to draw a box plot? - ✔✔ correct answer The minimum, maximum,
median, first and third quartiles
A box plot shows ___________. - ✔✔ correct answer The relative symmetry of a distribution for a
set of data
A dot plot can be used to show _________________. - ✔✔ correct answer 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 answer Cumulative frequency distribution
To locate the percentile for a given observation in a data set, the data must be ___________. - ✔✔
correct answer 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 answer 111
In a distribution, the second quartile corresponds with the __________. - ✔✔ correct answer
Median
A dot plot shows ____________. - ✔✔ correct answer The general shape of a distribution
