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The experimental method, Marintia Rodríguez Hernández, 217201634,…
The experimental method
Variable
anything which does not remain constant
There are 2 types
Dependent variable
Independent variable
There are different types of scales
Nominal
measures exclusive characteristics
Ordinal
can give ranking
Interval
indicates distance between the scores
Ratio
measures absolute variables
The logic of statistical inference
to be able to study
numerical data of various sorts
2 things are important
the extent to which the data are similar
the degree to which the data differ
mean (symbolised by X)
is the most frequently measure of similarity
Standard deviation (SD)
most important measure of dispersion
Additional statistical tools
Chi-square
calculates the difference between the expected frequencies
Statistical tests
estimate the degree of association between 2 variables
t-test and ANOVA
used to compare means
Types of experiments
Pre-experiment
Quasi-experiment
True experiment
Formal experiments and its variants
are important research tools
have added significantly to our knowledge
Experiments
are designed to collect data
in which threats to the
reliability and validity of the research are minimised
Marintia Rodríguez Hernández
217201634
13/10/2020
The experimental method-Nunan