QMB 3200 - EXAM 1 QUESTIONS WITH
CORRECT ANSWERS
Numerical variables can be subdivided into which two types? - Correct Answers -
Discrete and Continuous
The value of the variance is always greater than the standard deviation. - Correct
Answers -False
The Jersey number on a player's Jersey (shirt) is what type of variable? - Correct
Answers -Qualitative (Nominal)
A high positive value of kurtosis implies that the shape of the histogram has a - Correct
Answers -Well defined peak
In Descriptive Statistics for Ordinal Qualitative Variable, we typically - Correct Answers -
Tabulate Frequencies and Cumulative Frequencies
Data that arise from counts are considered _____________ and those that arise out of
measurement are considered __________________ respectively - Correct Answers -
Discrete and Continuous
If a numerical variable has these values: 10, 2, 10, 3, 18, 4, 9, then the median is: -
Correct Answers -9, 9.00, 9., 9.0, (all correct answers)
If a quantitative variable has these values: 2, 3, 4, 9, 10, 10, 18, its mean is: - Correct
Answers -8, 8.0, 8., 8.00 (all correct answers)
If the skewness of a dataset has a high negative value, such as -3, you expect the
distribution of this dataset to have - Correct Answers -A long left tail
Temperature in Celsius is an example of - Correct Answers -A quantitative variable with
interval scale
For a boxplot, the box itself represents what percent of the observations? - Correct
Answers -Middle 50%
If a numerical variable has these values: 10, 2, 10, 3, 18, 4, 9, then the mode is: -
Correct Answers -10, 10.0, 10.00, and 10. (all correct answers)
,A histogram of relative frequencies is appropriate for which of the following type of
data? - Correct Answers -Continuous
In Inferential Statistics, we - Correct Answers -Infer population characteristics from
sample characteristics
The median can also be described as:
- The middle observation when the data values are arranged in an ascending order
- The middle observation when the data values are arranged in descending order
- The 50th percentile
- The Second quartile
- All of the above - Correct Answers -- All of the above
In a data set, if the value of the highest frequency item is 55 and if its frequency is 20,
the mode for the data set is:
55
Cannot be answered from the information given.
20 - Correct Answers -55
If the first quartile is 5, the second quartile is 12, the third quartile is 15 and the fourth
quartile is 18, what is the Interquartile range?
7
13
12
None of the above - Correct Answers -- None of the above
- IQR= (third quartile-first quartile)=(15-5)=10
A variable is classified as ordinal if:
- The categories are considered very ordinary
- There is a natural ordering of categories
- We track the variable through a period of time
- There is no natural ordering of categories - Correct Answers -There is a natural
ordering of categories
If the average number of you can catch per day is 3, what is the probability that on a
given day you will catch fewer than 4 fish? (round the answer to four digits after the
decimal)
- 1.3333
- 0.8153
- 1.0000
- 0.6472
- 0.7500
- 0.1680 - Correct Answers -- =POISSON.DIST(3,3,TRUE)
, - 0.6472
The height of each spoke (bar) corresponding to a value of the random variable X in a
Probability Distribution Plot represents:
-Area
- 100%
- Probability
- Frequency - Correct Answers -Probability
The sum total of all heights of spokes (bars) for all possible values of the random
variable in a Discrete Probability Distribution is equal to:
-1
- Sample Size
- 100
- Total Area - Correct Answers -1
Which one among the following is a discrete probability distribution?
- Normal
- Binomial
- t distribution
- Continuous Uniform - Correct Answers -Binomial = Discrete Probability Distribution
If the average number of fish you can catch per day is 3, what is the probability that on a
given day you will catch more than 4 fish? (round the answer to four digits after the
decimal)
- 0.1847
- 0.8153
- 0.4096
- 0.7500
- 1.3300
- 1.0000 - Correct Answers -- =POISSON.DIST(4,3,TRUE)
- 0.8153
- 1 - 0.8153
- 0.1847
Identify the probability distribution for the random variable "Number of days out of ten
days that you catch at least one fish", given that catching at least one fish a day is
considered a success.
- Binomial
- Discrete Uniform
- Hypergeometric
- Poisson - Correct Answers -Binomial
Identify what probability distribution the random variable "Number of fish you catch per
day" would follow.
- Discrete Uniform
CORRECT ANSWERS
Numerical variables can be subdivided into which two types? - Correct Answers -
Discrete and Continuous
The value of the variance is always greater than the standard deviation. - Correct
Answers -False
The Jersey number on a player's Jersey (shirt) is what type of variable? - Correct
Answers -Qualitative (Nominal)
A high positive value of kurtosis implies that the shape of the histogram has a - Correct
Answers -Well defined peak
In Descriptive Statistics for Ordinal Qualitative Variable, we typically - Correct Answers -
Tabulate Frequencies and Cumulative Frequencies
Data that arise from counts are considered _____________ and those that arise out of
measurement are considered __________________ respectively - Correct Answers -
Discrete and Continuous
If a numerical variable has these values: 10, 2, 10, 3, 18, 4, 9, then the median is: -
Correct Answers -9, 9.00, 9., 9.0, (all correct answers)
If a quantitative variable has these values: 2, 3, 4, 9, 10, 10, 18, its mean is: - Correct
Answers -8, 8.0, 8., 8.00 (all correct answers)
If the skewness of a dataset has a high negative value, such as -3, you expect the
distribution of this dataset to have - Correct Answers -A long left tail
Temperature in Celsius is an example of - Correct Answers -A quantitative variable with
interval scale
For a boxplot, the box itself represents what percent of the observations? - Correct
Answers -Middle 50%
If a numerical variable has these values: 10, 2, 10, 3, 18, 4, 9, then the mode is: -
Correct Answers -10, 10.0, 10.00, and 10. (all correct answers)
,A histogram of relative frequencies is appropriate for which of the following type of
data? - Correct Answers -Continuous
In Inferential Statistics, we - Correct Answers -Infer population characteristics from
sample characteristics
The median can also be described as:
- The middle observation when the data values are arranged in an ascending order
- The middle observation when the data values are arranged in descending order
- The 50th percentile
- The Second quartile
- All of the above - Correct Answers -- All of the above
In a data set, if the value of the highest frequency item is 55 and if its frequency is 20,
the mode for the data set is:
55
Cannot be answered from the information given.
20 - Correct Answers -55
If the first quartile is 5, the second quartile is 12, the third quartile is 15 and the fourth
quartile is 18, what is the Interquartile range?
7
13
12
None of the above - Correct Answers -- None of the above
- IQR= (third quartile-first quartile)=(15-5)=10
A variable is classified as ordinal if:
- The categories are considered very ordinary
- There is a natural ordering of categories
- We track the variable through a period of time
- There is no natural ordering of categories - Correct Answers -There is a natural
ordering of categories
If the average number of you can catch per day is 3, what is the probability that on a
given day you will catch fewer than 4 fish? (round the answer to four digits after the
decimal)
- 1.3333
- 0.8153
- 1.0000
- 0.6472
- 0.7500
- 0.1680 - Correct Answers -- =POISSON.DIST(3,3,TRUE)
, - 0.6472
The height of each spoke (bar) corresponding to a value of the random variable X in a
Probability Distribution Plot represents:
-Area
- 100%
- Probability
- Frequency - Correct Answers -Probability
The sum total of all heights of spokes (bars) for all possible values of the random
variable in a Discrete Probability Distribution is equal to:
-1
- Sample Size
- 100
- Total Area - Correct Answers -1
Which one among the following is a discrete probability distribution?
- Normal
- Binomial
- t distribution
- Continuous Uniform - Correct Answers -Binomial = Discrete Probability Distribution
If the average number of fish you can catch per day is 3, what is the probability that on a
given day you will catch more than 4 fish? (round the answer to four digits after the
decimal)
- 0.1847
- 0.8153
- 0.4096
- 0.7500
- 1.3300
- 1.0000 - Correct Answers -- =POISSON.DIST(4,3,TRUE)
- 0.8153
- 1 - 0.8153
- 0.1847
Identify the probability distribution for the random variable "Number of days out of ten
days that you catch at least one fish", given that catching at least one fish a day is
considered a success.
- Binomial
- Discrete Uniform
- Hypergeometric
- Poisson - Correct Answers -Binomial
Identify what probability distribution the random variable "Number of fish you catch per
day" would follow.
- Discrete Uniform
