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Variables|RQs & Hs|Validity, Reliability, Credibility|
Chs: 6,7, & 9
32
Communication
Undergraduate 4
12/09/2013

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Term
Variable
Definition
The concept we want to measure.

(1) “a person’s age”, (2) “biological sex”
Term
Values
Definition
The measurements we take
e.g., (1) number of years, (2) male or female
Term
Conceptual definition
Definition
This definition of variables explains how we define the concepts we want to study
Term
Operational definition
Definition
This definition of variables explains: “rules” you create for identifying when something is present or not
Term
Nominal
Definition
In this level of measurement a variable whose values are unordered categories, with no mathematical meaning
Term
Ordinal
Definition
In this level of measurement a variable whose values are categories, with no mathematical meaning, but have an order
Term
Likert scale
Definition
Strongly Disagree > Disagree > Undecided > Agree > Strongly
Agree
Term
Interval
Definition
In this level of measurement a variable’s values have mathematical meaning. No zero value so we cannot talk about proportions
Term
Ratio
Definition
In this level of measurement a variable’s values have mathematical meaning. There IS a Zero value, so we can talk about proportions
Term
Unidimensional
Definition
When a variable is measured using one set of values it is ______
Term
Multidimensional
Definition
When a variable is measured using multiple sets of values it is ______
Term
Dependent Variable
Definition
This variable is the thing you are really interested in
Term
Independent Variable
Definition
This variable is what you think might change the DV
Term
Research Questions
Definition
These examine the relationship between IVs & DVs. We ask these when we do not know what to expect.
Term
Hypothesis
Definition
These test the relationship between IVs & DVs. We state these when we know what to expect.
Term
Null Hypothesis
Definition
In this type of hypothesis the relationship between the IV & DV does not exist
Term
Reliability
Definition
_____ is shown by how much our measurement scheme consistently produces the same results
Term
Test-Retest
Definition
This type of reliability test uses the same measurement scheme on the same people twice, at different times
Term
Alternative Form
Definition
This type of reliability test compares your measurement scheme to a different scheme designed to measure the same thing
Term
Split-Half
Definition
This type of reliability test compares one half of your sample to the other half
Term
0.80
Definition
The minimum acceptable reliability finding for most statistical tests is ____
Term
Spearman’s Correlation = r
Definition
This reliability statistic test is the most common
Term
Krippendorff’s alpha = α
Definition
This reliability statistic test is the most flexible & conservative
Term
Validity
Definition
Our measurement scheme accurately measures what it intends to measure
Term
Face validity
Definition
With this type of validity our measurement just seems to make sense
Term
Criterion validity
Definition
An example of this type of validity is 30% of my survey respondents had a college degree
Term
Concurrent validity
Definition
An example of this type of validity is two survey questions asking the same thing, in different ways
Term
A measurement scheme has to be reliable to be valid. But not all reliable measurement schemes are always valid.
Definition
Validity is the more important than reliability because?
Term
History, Maturity, & Testing all do
Definition
What Hurts Reliability & Validity?
Term
Credibility
Definition
How much the reader believes the researcher
Term
Member Check
Definition
Obtaining feedback on research from representatives under study
Term
Legitimation
Definition
Whether or not you have the proper background to “speak for” the participants in your study
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