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THE EXPERIMENTAL METHOD - Coggle Diagram
THE EXPERIMENTAL METHOD
Context
Experiments are carried out to
explore strength of variable relationships
Variables are:
classified by
Ordinal scale
Interval scale
Nominal Scale
Ratio scale
labaled
Independent
Dependent
Logic of Statistical Inference
Requires sample selection
to collect data
it´s important to know:
Standard Deviation
variation of scores set in relation to the mean
Normal Distribution
frequency distribution represented by a curve
Mean
average of all scores
Standard error
standard deviation of sample means
Statistical Tools
differ acording to the data
analized or compared
ANOVA (analysis of variance)
compares more than two means / groups
Chi-square
calculates difference between
expected and actual frequency
to see if its significant
T-test
compares two means
Correlation
estimates association between variables
A psychometric study
has this characteristics
Materials
Procedure
Subjects
Type of data
Question / Hypothesis
Type of Analysis
Aim
Conclusions
research Area
can be
Reported
Critiqued
Three Types
Quasi-Experimental
uses experimental & control groups
lacks random assigment of subjects
has pre and post tests
True experiemental
uses experimental & control groups
random assigment of subjects
has pre and post tests
Pre-Eperimental
lack of control group
uses pre and post tests