BADM 210 - Exam 1 Questions and
Answers
What is a variance? - ANSWER-How much the different observations deviate from
the average
What are the units on variance? - ANSWER-The observed data units squared
What does standard deviation measure? - ANSWER-the amount of variation
What does a percentile measure? - ANSWER-observation for which the percentile of
the observations are lower than the given value
What does the z-score measure? - ANSWER-standardize measure of distance to be
the same magnitude for any sample; NO UNITS; how far is it from the mean?
What is the empirical rule of the Z-score? - ANSWER-most data will fall between -3
and +3 z-score
correlation - ANSWER-linear relationship between two variables
covariance - ANSWER-measure of the linear relationship between 2 variables
descriptive analytics - ANSWER-describe what happened in the past; a summary
predictive analytics - ANSWER-techniques that use models from past data to make
predictions
prescriptive analytics - ANSWER-outputs a decision; a rule is applied so that you can
make a business decision
data dashboard - ANSWER-a data visualization tool that updates in real time and
gives multiple outputs (examples: tables, charts, maps, summary stats)
What are the Four V's of Big Data? - ANSWER-Volume(ability to capture and store),
Velocity(speed of the data), Variety(unstructured data), Veracity(uncertainty in the
data)
Hadoop - ANSWER-allows storage and processing to be shared across many server
computers
observation - ANSWER-set of values corresponding to a set of variables
Answers
What is a variance? - ANSWER-How much the different observations deviate from
the average
What are the units on variance? - ANSWER-The observed data units squared
What does standard deviation measure? - ANSWER-the amount of variation
What does a percentile measure? - ANSWER-observation for which the percentile of
the observations are lower than the given value
What does the z-score measure? - ANSWER-standardize measure of distance to be
the same magnitude for any sample; NO UNITS; how far is it from the mean?
What is the empirical rule of the Z-score? - ANSWER-most data will fall between -3
and +3 z-score
correlation - ANSWER-linear relationship between two variables
covariance - ANSWER-measure of the linear relationship between 2 variables
descriptive analytics - ANSWER-describe what happened in the past; a summary
predictive analytics - ANSWER-techniques that use models from past data to make
predictions
prescriptive analytics - ANSWER-outputs a decision; a rule is applied so that you can
make a business decision
data dashboard - ANSWER-a data visualization tool that updates in real time and
gives multiple outputs (examples: tables, charts, maps, summary stats)
What are the Four V's of Big Data? - ANSWER-Volume(ability to capture and store),
Velocity(speed of the data), Variety(unstructured data), Veracity(uncertainty in the
data)
Hadoop - ANSWER-allows storage and processing to be shared across many server
computers
observation - ANSWER-set of values corresponding to a set of variables
