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Ch. 2 Experimental Research (Empirical Research (Descriptive, Relational,…
Ch. 2 Experimental Research
Methods &
Methodology
Methods
various ways to conduct research
ex.:
data gathering though diaries
questionnaires
interviews
Methodology
how research is done, how we find out about things
ex.:
user-centered design
participatory design
genius design
bt' more general principles that guide our research
Empirical Research
Descriptive
Relational
Experimental
Design of an Experiment
Treatments or Conditions
Units
(participants)
Assignment Method
Type I and II errors
Type I. alpha
Significance Tests
how confidently we can
Generalize our results
to the Entire Population
ex.:
T-test which is significant at P < 0.05
95% of the times the Results are applicable to the Entire Pop.
whether the Observed Group Means
are Truly different
significance test, P value
False Positive
we say that Ha is True for the Entire Pop.
while it's Not
Type II, beta
False Negative
Pros & Cons
Pros
Cons
requires well-defined, testable hypotheses
strict Control of factors
lab experiments may not have World Validity