DSOM II EXAM QUESTIONS AND ANSWERS WITH
COMPLETE VERIFIED ANSWERS
Which term describes a compilation of facts, figures or other contents, both
numerical and nonnumerical?
Data
knowledge
We use a blend of DATA, contextual information, experience and intuition to derive
knowledge from data and information
Information
Information is DATA that has been organized, analyzed and processed in a meaningful
and purposeful way
Skewness
The blank coefficient measures the degree to which a distribution is not symmetric
about its mean.
Calculate the Mean Absolute Deviation for the following data: We have observed
the age of 3 individuals in a study, where the mean age is 40. The observed ages
were 31, 40, and 49. What is the MAD?
A. 9
B. 6
C. -6
D. Not enough data
,C. 6
Reason =abs((31-40)+(40-40) +(49-40))/3 = 6
Kurtosis
The blank coefficient is a summary measure that tells us whether the tails of the
distribution are more or less extreme than the normal distribution.
There are several measures of dispersion that gauge the variability of a data set.
Select all of the measures below that are useful for measuring dispersion.
A. Interquartile Range
B. Range
C. Use the mean
D. Mean Absolute Deviation
A. Interquartile Range
B. Range
D. Mean Absolute Deviation
The mean is a measure of central tendency (B)
Association
A measure of blank quantifies the direction and strength of the linear relationship
between two variables, x and y.
Population
The formula for the variance differs depending on whether we have a sample or a
,Which of the following are common measures of shape?
A. Skewness coefficient
B. MAD or the Mean absolute deviation
C. Kurtosis coefficient
D. Range
A. Skewness coefficient
C. Kurtosis coefficient
Which of the following are NOT common measures of shape?
A. Skewness coefficient
B. MAD or the Mean absolute deviation
C. Kurtosis coefficient
D. Range
B. MAD or the Mean absolute deviation
(Reason: This is a measure of dispersion)
D. Range
(Reason: This is a measure of dispersion)
Which of the following is true of the covariance? Select all that are true!
A. Covariance can be negative, positive, or zero
, B. The covariance is sensitive to the units of measurement
C. If the covariance is negative, then x and y have a negative linear relationship.
D. We can comment on the strength of the relationships using the covariance
A. Covariance can be negative, positive, or zero
B. The covariance is sensitive to the units of measurement
C. If the covariance is negative, then x and y have a negative linear relationship.
Which of the following is false of the covariance? Select all that are false!
A. Covariance can be negative, positive, or zero
B. The covariance is sensitive to the units of measurement
C. If the covariance is negative, then x and y have a negative linear relationship.
D. We can comment on the strength of the relationships using the covariance
D. We can comment on the strength of the relationships using the covariance
(Reason: We CANNOT comment on the strength of the relationships, just that there is a
relationship!)
COMPLETE VERIFIED ANSWERS
Which term describes a compilation of facts, figures or other contents, both
numerical and nonnumerical?
Data
knowledge
We use a blend of DATA, contextual information, experience and intuition to derive
knowledge from data and information
Information
Information is DATA that has been organized, analyzed and processed in a meaningful
and purposeful way
Skewness
The blank coefficient measures the degree to which a distribution is not symmetric
about its mean.
Calculate the Mean Absolute Deviation for the following data: We have observed
the age of 3 individuals in a study, where the mean age is 40. The observed ages
were 31, 40, and 49. What is the MAD?
A. 9
B. 6
C. -6
D. Not enough data
,C. 6
Reason =abs((31-40)+(40-40) +(49-40))/3 = 6
Kurtosis
The blank coefficient is a summary measure that tells us whether the tails of the
distribution are more or less extreme than the normal distribution.
There are several measures of dispersion that gauge the variability of a data set.
Select all of the measures below that are useful for measuring dispersion.
A. Interquartile Range
B. Range
C. Use the mean
D. Mean Absolute Deviation
A. Interquartile Range
B. Range
D. Mean Absolute Deviation
The mean is a measure of central tendency (B)
Association
A measure of blank quantifies the direction and strength of the linear relationship
between two variables, x and y.
Population
The formula for the variance differs depending on whether we have a sample or a
,Which of the following are common measures of shape?
A. Skewness coefficient
B. MAD or the Mean absolute deviation
C. Kurtosis coefficient
D. Range
A. Skewness coefficient
C. Kurtosis coefficient
Which of the following are NOT common measures of shape?
A. Skewness coefficient
B. MAD or the Mean absolute deviation
C. Kurtosis coefficient
D. Range
B. MAD or the Mean absolute deviation
(Reason: This is a measure of dispersion)
D. Range
(Reason: This is a measure of dispersion)
Which of the following is true of the covariance? Select all that are true!
A. Covariance can be negative, positive, or zero
, B. The covariance is sensitive to the units of measurement
C. If the covariance is negative, then x and y have a negative linear relationship.
D. We can comment on the strength of the relationships using the covariance
A. Covariance can be negative, positive, or zero
B. The covariance is sensitive to the units of measurement
C. If the covariance is negative, then x and y have a negative linear relationship.
Which of the following is false of the covariance? Select all that are false!
A. Covariance can be negative, positive, or zero
B. The covariance is sensitive to the units of measurement
C. If the covariance is negative, then x and y have a negative linear relationship.
D. We can comment on the strength of the relationships using the covariance
D. We can comment on the strength of the relationships using the covariance
(Reason: We CANNOT comment on the strength of the relationships, just that there is a
relationship!)
