Examlex
A sample is used to obtain a 95% confidence interval for the mean of a population.The confidence interval goes from 15 to 19.If the same sample had been used to test the null hypothesis that the mean of the population is equal to 20 versus the alternative hypothesis that the mean of the population differs from 20,the null hypothesis could be rejected at a level of significance of 0.02.
One-Tailed Tests
Statistical tests that determine if there is a significant difference in a specific direction between two groups.
Nominal Scale
The simplest form of measurement in which data are categorized based on qualitative attributes or names without a numerical or ordered value.
Independent Variables
Variables that are manipulated or controlled in an experiment to test their effect on dependent variables.
Dependent Variables
A measure that is expected to vary in response to changes in an independent variable within an experiment.
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