In Hypothesis Testing 1, you were introduced to the ideas of hypothesis testing in the context of deciding whether a coin was fair or biased in favor of heads. In this section hypothesis testing ...

H₀ Null Hypothesis Assumes no effect or difference exists. H₁ or Hᴀ Alternative Hypothesis Indicates an effect or difference exists. μ Population Mean The average of an entire population. x̄ Sample ...

Beyond sampling issues, the question of so-called outliers raises the problem of "abnormal" sampled values. If, for example, we are interested in the sum of a throw of five dice, obtaining a sum equal ...

In the early 20 th century, Guinness breweries in Dublin had a policy of hiring the best graduates from Oxford and Cambridge to improve their industrial processes. At the time, it was considered a ...

A t-test for a population mean tests the population mean against a hypothesized value. It is appropriate when the population standard deviation is unknown and the sample size is small. This applet ...