Inference about Comparing Two Populations

5 important questions on Inference about Comparing Two Populations

How do you pronounce the following symbol and where does it stand for?

  • S sub p squared
  • Pooled variance estimator

How do you call data that is gathered from a controlled situation?

Experimental data

How do you call an experiment, one in which each observation from one sample can be matched with an observation in another?

Matched pairs experiment
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How do you call, in a matched pairs experiment, the mean of the paired differences?

Mean of the population of differences

How do you call something  that is used to estimate the standard error of the difference between two proportions when the proportions of two populations are hypothesized to be equal?

Pooled proportion estimate

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