Descriptive - answer-Past data only; Not predicting or optimizing
Predictive - answer-Past to predict the future; Predicting, no optimizing
Prescriptive - answer-Past to predict the future and optimizing
Omission - answer-Missing information
Out of Range - answer-Doesn't match the data ...
C207 WGU DATA DRIVEN DECISION MAKING
STUDY GUIDE
Descriptive - answer-Past data only; Not predicting or optimizing
Predictive - answer-Past to predict the future; Predicting, no optimizing
Prescriptive - answer-Past to predict the future and optimizing
Omission - answer-Missing information
Out of Range - answer-Doesn't match the data or not true
Reliable - answer-Constant and repeatable. A measure of the instrument
Valid - answer-Measures what is intended to be measured
Measurement bias - answer-Includes representative sample, random, large enough
sample
Information bias - answer-Ignore the purpose of the information collection; not truthful
answers
Big Data - answer-Both structure and unstructured; to large to process using traditional
database and software techniques
Data mining - answer-Process of discovering pattern in large data sets
Why collect big data? - answer-Used to encourage buying behavior
Analytics - answer-the extensive use of data, statistical and quantitative analysis,
explanatory and predictive models, and fact-based management to drive decisions and
and add value
Variable - answer-An expression that can be assigned to data
Continuous data - answer-Data that can lay along any point in a range of data (age 22.6
old)
Discrete data - answer-Whole values only and clear boundaries
Nominal data - answer-Categorical data used to label subjects in a study; discrete (male
female)
, Ordinal data - answer-Allows you to place objects on some in some kind of order
according to some quality; discrete (black belts 3rd degree higher than 1st degree)
Interval data - answer-has order; all objects are equal interval apart; no natural zero
point and zero does not represent the absence of the property measured; Continuous
(time, date, temperature)
Ratio data - answer-Has a unique zero point - numbers can be compared as multiples
of one another, continuous (income, stock, repeat customers)
Observational studies - answer-used when impractical and impossible to control the
conditions of the study
Prospective cohort study - answer-Observe people going forward in time from the time
of their entry into the study
Experimental studies - answer-All variable measurements and manipulations are under
researcher's control.
Experimental studies: Experimental units - answer-Subjects or objects under
observations
Experimental studies: Experimental treatments - answer-Procedure applied to each
subject
Experimental studies: Responses - answer-Effects of the experimental treatments
1st step of statistical experiment - answer-Identify the experimental units from which you
want to measure something
2nd step of statistical experiment - answer-Id the treatments and controls that you will
use on control group
3rd step of statistical experiment - answer-Generate a testable hypothesis
construct validity - answer-study actual measure what is being investigated
content validity - answer-Construct measures what it claims to measure
Internal validity - answer-Biases may have entered the study
Blind study - answer-participants are not told if they are in treatment group or control
group
Double blind - answer-neither treatment allocator nor participant know which group
participant is in
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