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Basic Stats in Computer Science (Scientific Process (Identify appropriate…
Basic Stats in Computer Science
Scientific Process
Identify appropriate
population
to study
Calculate
sample size
necessary for study
Research
hypothesis
Sample
accordingly from population
Interpret the results
with respect to the research hypothesis
Statistical analysis
of the sampled data
Confidential
Interval
Standard
Deviation
Variability in
observations
within the sample (one sample)
how well the sample mean represents the
sample itself
Standard Error
Variability of
sample means
(mean of multiple samples)
Not each sample
how well the sample mean represent the
population mean
Measure of the
precision
of the sample mean
SE = SD/√(sample size)
Hypothesis
Directional hypothesis
One-tailed test
When is appropriate?
A result in the
opposite direction
to that expected would result in the
same action
as a
non-significant result
Non-directional hypothesis
Two-tailed test
T-Test
Independent Samples T-Test
Two experimental conditions but
different participants
Paired-Samples T-Test
Two conditions, but
same participants