
227Data Analysis and Statistical Testing
TABLE 6.11
Summary of Statistical Tests
Test Assumptions Data Scale Normality
One sample t-test The data should not have any
signicant outliers.
Interval or ratio. Required
The observations should be
independent.
Two sample t-test Standard deviations of the two
populations must be equal.
Interval or ratio. Required
Samples must be independent of
eachother.
Interval or ratio.
The samples are randomly drawn
from respective populations.
Interval or ratio.
Paired t-test Samples must be related with each
other.
Interval or ratio. Required
The data should not have any
signicant outliers.
Chi-squared test Samples must ...