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Introduction to Biostatistics

-statistics are simply a collection of tools that researchers employ to help answer research questions

group difference tests

Independent T-Test

  • t-test looks at the mean and variance of a sample of measurements, where the null hypothesis is that the sample is drawn from a distribution with mean m.
  • The test explains  the difference between the observed and expected means, scaled by the variance of the data, and tells us how likely one is to get a sample of that mean and variance, assuming that the sample is drawn from a normal distribution with mean mu..

Computational formula for independent t-test:

t-test formula

Conceptual model of independent t-test:





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