BSTAT 3321 Final questions well
answered to pass
The mean return on equity (ROE) for a group of firms in an industry is 15% with a variance of
9%. The coefficient of variation of the industry's ROE is __________.
A) .6
B) 1.7
C) 5.0
D) .2 - correct answer ✔✔D) .2
Which of the following represents a population and a sample from that population?
A) Attendees at a sporting event and those who purchased popcorn at said sporting event
B) Full-time employees at a marketing firm, and temporary summer interns at the marketing
firm
C) Stocks available on the NYSE and stocks on the NASDAQ
D) Seniors at Boston College and students in a first-semester business statistics course - correct
answer ✔✔A) Attendees at a sporting event and those who purchased popcorn at said sporting
event
Suppose the average price for new cars has a mean of $30,100, a standard deviation of $5,600
and is normally distributed. Based on this information, what interval of prices would we expect
at least 95% of new car prices to fall within?
A) $13,300 to $46,900
B) $24,500 to $35,700
C) $18,900 to $41,300
,D) $7.700 to $52,500 - correct answer ✔✔C) $18,900 to $41,300
Consider a population with data values of 12 8 28 22 12 30 14 The population standard
deviation is the closest to __________.
A) 64.00
B) 8.00
C) 8.64
D) 74.67 - correct answer ✔✔B) 8.00
Differences between categories are meaningless with __________ data.
A) interval B) ordinal C) continuous D) ratio - correct answer ✔✔B) ordinal
Amounts spent by a sample of 200 customers at a retail store are summarized in the following
relative frequency distribution. Amount Spent (in $) Frequency 0 up to 10 15 10 up to 20 75 20
up to 30 55 30 up to 40 55 The mean amount spent by customers is the closest to __________.
A) $50.00 B) $17.50 C) $20.00 D) $22.50 - correct answer ✔✔D) $22.50
An analyst constructed the following frequency distribution on the monthly returns for 50
selected stocks. Class (in percent) Frequency −10 up to 0 8 0 up to 10 25 10 up to 20 15 20 up to
30 2 The number of stocks with returns of less than 10% is __________.
A) 48 B) 33 C) 8 D) 25 - correct answer ✔✔B) 33
The following histogram represents the number of pages in each book within a collection. What
is the frequency of books containing at least 250 but fewer than 300 pages?
, A) 12
B) 6
C) 5
D) 7 - correct answer ✔✔D) 7
Let P(A)=.3 and P(B)=.4 Suppose A and B are independent. What is the value of P(B|A)? A) 0.7 B)
0.3 C) 0.4 D) 0.12 - correct answer ✔✔C) 0.4
Consider the following frequency distribution. Class Frequency 12 up to 15 3 15 up to 18 6 18 up
to 21 3 21 up to 24 4 24 up to 27 4 How many observations are less than 21? A) 12 B) 24 C) 18
D) 6 - correct answer ✔✔A) 12
Sales for Adidas grew at a rate of 0.5196 in Year 1, 0.0213 in Year 2, 0.0485 in Year 3, and
−0.0387 in Year 4. The average growth rate for Adidas during these four years is the closest to
__________.
A) 14.02% B) 13.77% C) 11.83% D) 3.49% - correct answer ✔✔C) 11.83%
For both categorical and numerical variables, what is the difference between the relative
frequency and the percent frequency?
A) The relative frequency equals the percent frequency multiplied by 100. B) As opposed to the
relative frequency, the percent frequency is divided by the number of observations in the data
set. C) The percent frequency equals the relative frequency multiplied by 100. D) As opposed to
the percent frequency, the relative frequency is divided by the number of observations in the
data set. - correct answer ✔✔C) The percent frequency equals the relative frequency multiplied
by 100.
After extensive research examining 10,000 calls from customers on a typical 12-hour day at C&A
technical support center, the analyst uses the following table to summarize the frequency
answered to pass
The mean return on equity (ROE) for a group of firms in an industry is 15% with a variance of
9%. The coefficient of variation of the industry's ROE is __________.
A) .6
B) 1.7
C) 5.0
D) .2 - correct answer ✔✔D) .2
Which of the following represents a population and a sample from that population?
A) Attendees at a sporting event and those who purchased popcorn at said sporting event
B) Full-time employees at a marketing firm, and temporary summer interns at the marketing
firm
C) Stocks available on the NYSE and stocks on the NASDAQ
D) Seniors at Boston College and students in a first-semester business statistics course - correct
answer ✔✔A) Attendees at a sporting event and those who purchased popcorn at said sporting
event
Suppose the average price for new cars has a mean of $30,100, a standard deviation of $5,600
and is normally distributed. Based on this information, what interval of prices would we expect
at least 95% of new car prices to fall within?
A) $13,300 to $46,900
B) $24,500 to $35,700
C) $18,900 to $41,300
,D) $7.700 to $52,500 - correct answer ✔✔C) $18,900 to $41,300
Consider a population with data values of 12 8 28 22 12 30 14 The population standard
deviation is the closest to __________.
A) 64.00
B) 8.00
C) 8.64
D) 74.67 - correct answer ✔✔B) 8.00
Differences between categories are meaningless with __________ data.
A) interval B) ordinal C) continuous D) ratio - correct answer ✔✔B) ordinal
Amounts spent by a sample of 200 customers at a retail store are summarized in the following
relative frequency distribution. Amount Spent (in $) Frequency 0 up to 10 15 10 up to 20 75 20
up to 30 55 30 up to 40 55 The mean amount spent by customers is the closest to __________.
A) $50.00 B) $17.50 C) $20.00 D) $22.50 - correct answer ✔✔D) $22.50
An analyst constructed the following frequency distribution on the monthly returns for 50
selected stocks. Class (in percent) Frequency −10 up to 0 8 0 up to 10 25 10 up to 20 15 20 up to
30 2 The number of stocks with returns of less than 10% is __________.
A) 48 B) 33 C) 8 D) 25 - correct answer ✔✔B) 33
The following histogram represents the number of pages in each book within a collection. What
is the frequency of books containing at least 250 but fewer than 300 pages?
, A) 12
B) 6
C) 5
D) 7 - correct answer ✔✔D) 7
Let P(A)=.3 and P(B)=.4 Suppose A and B are independent. What is the value of P(B|A)? A) 0.7 B)
0.3 C) 0.4 D) 0.12 - correct answer ✔✔C) 0.4
Consider the following frequency distribution. Class Frequency 12 up to 15 3 15 up to 18 6 18 up
to 21 3 21 up to 24 4 24 up to 27 4 How many observations are less than 21? A) 12 B) 24 C) 18
D) 6 - correct answer ✔✔A) 12
Sales for Adidas grew at a rate of 0.5196 in Year 1, 0.0213 in Year 2, 0.0485 in Year 3, and
−0.0387 in Year 4. The average growth rate for Adidas during these four years is the closest to
__________.
A) 14.02% B) 13.77% C) 11.83% D) 3.49% - correct answer ✔✔C) 11.83%
For both categorical and numerical variables, what is the difference between the relative
frequency and the percent frequency?
A) The relative frequency equals the percent frequency multiplied by 100. B) As opposed to the
relative frequency, the percent frequency is divided by the number of observations in the data
set. C) The percent frequency equals the relative frequency multiplied by 100. D) As opposed to
the percent frequency, the relative frequency is divided by the number of observations in the
data set. - correct answer ✔✔C) The percent frequency equals the relative frequency multiplied
by 100.
After extensive research examining 10,000 calls from customers on a typical 12-hour day at C&A
technical support center, the analyst uses the following table to summarize the frequency
