MBA 6040 || Errorless Answers 100%.
Both ordinal and nominal variables are categorical. correct answers True - Categorical Data:
Data sets that can be separated into different categories that can be distinguished by non-numeric
characteristics (names/labels). Ordinal variable has an implicit order (e.g., Excellent, Good,
Average) while nominal variable does not (e.g., gender).
The time required to drive from Detroit to Lansing is an example of a discrete random variable
correct answers False - .....is an example of a continuous random variable because any value is
possible within a certain range.
Phone numbers, Social Security numbers, and zip codes are examples of numerical variables.
correct answers False - Social Security numbers, and zip codes are considered Categorical Data.
Some data sets consist of numbers, while other data sets are non-numerical, consisting of names
or labels. To distinguish between the two types of data, we use the terms Numerical Data and
Categorical Data.
If vou are in a class where most students do reasonably well on a test but a few pull down the
class average, the histogram describing the test scores will indicate a positively-skewed
distribution. correct answers False - "A few pull down the class average" indicates the tail is to
the left - a negatively-skewed distribution.
The scatterplot is a graphical technique used to describe the relationship between two numerical
variables. correct answers True - A scatterplot displays values of two variables using Cartesian
coordinates.
Median is a better statistic than average for measuring center of a skewed distribution. correct
answers True - Average can be easily influenced by outliers, which are common in a skewed
distribution.
A variable (or field) is an attribute, or measurement, on members of a population, whereas an
observation (or case or record) is a list of all variable values for a single member of a population.
correct answers True - Correct, variable is an attribute (e.g., age) while an observation consists of
all variable values for a single record of a population.
, A data sample has a mode of 140, a median of 130, and a mean of 120. The distribution of the
data is positively skewed. correct answers False - The distribution is negatively skewed because
the median is larger than the mean - tail is pulled by the mean.
If two data sets have the same range, the smallest and largest observations in both sets should be
the same correct answers False - Range = Max - min
The standard deviation is measured in original units, such as dollars and pounds. correct answers
True - Variance is in squared units while standard deviation is in original unit (page 38 of the
text).
The median is one of the most frequently used measures of variability. correct answers False -
Median is not a measure of variability but of central tendency.
A correlation coefficient of O indicating no linear relationship but there could be nonlinear
relationship between the two variables. correct answers True - Correlation is relevant only for
measuring linear relationships.
Numerical variables can be subdivided into which two types? correct answers Discrete and
Continuous - Based on the data, we can use statistics to make conclusions about the people or
elements that the data is describing. Some data sets consist of numbers, while other data sets are
non-numerical, consisting of names or labels. To distinguish between the two types of data, we
use the terms Numerical Data and Categorical Data.
A sample of a population taken at one particular point in time is categorized as: correct answers
Cross Sectional
A Scatterplot allows on to see correct answers The type of relationship (linear vs. nonlinear) can
also be identified through a scatterplot.
what type of relationship there is between two variables
whether there is any relationship between two variables
Both ordinal and nominal variables are categorical. correct answers True - Categorical Data:
Data sets that can be separated into different categories that can be distinguished by non-numeric
characteristics (names/labels). Ordinal variable has an implicit order (e.g., Excellent, Good,
Average) while nominal variable does not (e.g., gender).
The time required to drive from Detroit to Lansing is an example of a discrete random variable
correct answers False - .....is an example of a continuous random variable because any value is
possible within a certain range.
Phone numbers, Social Security numbers, and zip codes are examples of numerical variables.
correct answers False - Social Security numbers, and zip codes are considered Categorical Data.
Some data sets consist of numbers, while other data sets are non-numerical, consisting of names
or labels. To distinguish between the two types of data, we use the terms Numerical Data and
Categorical Data.
If vou are in a class where most students do reasonably well on a test but a few pull down the
class average, the histogram describing the test scores will indicate a positively-skewed
distribution. correct answers False - "A few pull down the class average" indicates the tail is to
the left - a negatively-skewed distribution.
The scatterplot is a graphical technique used to describe the relationship between two numerical
variables. correct answers True - A scatterplot displays values of two variables using Cartesian
coordinates.
Median is a better statistic than average for measuring center of a skewed distribution. correct
answers True - Average can be easily influenced by outliers, which are common in a skewed
distribution.
A variable (or field) is an attribute, or measurement, on members of a population, whereas an
observation (or case or record) is a list of all variable values for a single member of a population.
correct answers True - Correct, variable is an attribute (e.g., age) while an observation consists of
all variable values for a single record of a population.
, A data sample has a mode of 140, a median of 130, and a mean of 120. The distribution of the
data is positively skewed. correct answers False - The distribution is negatively skewed because
the median is larger than the mean - tail is pulled by the mean.
If two data sets have the same range, the smallest and largest observations in both sets should be
the same correct answers False - Range = Max - min
The standard deviation is measured in original units, such as dollars and pounds. correct answers
True - Variance is in squared units while standard deviation is in original unit (page 38 of the
text).
The median is one of the most frequently used measures of variability. correct answers False -
Median is not a measure of variability but of central tendency.
A correlation coefficient of O indicating no linear relationship but there could be nonlinear
relationship between the two variables. correct answers True - Correlation is relevant only for
measuring linear relationships.
Numerical variables can be subdivided into which two types? correct answers Discrete and
Continuous - Based on the data, we can use statistics to make conclusions about the people or
elements that the data is describing. Some data sets consist of numbers, while other data sets are
non-numerical, consisting of names or labels. To distinguish between the two types of data, we
use the terms Numerical Data and Categorical Data.
A sample of a population taken at one particular point in time is categorized as: correct answers
Cross Sectional
A Scatterplot allows on to see correct answers The type of relationship (linear vs. nonlinear) can
also be identified through a scatterplot.
what type of relationship there is between two variables
whether there is any relationship between two variables
