Suppose all 1500 coins are fair About how many students will conclude that

# Suppose all 1500 coins are fair about how many

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Suppose all 1500 coins are fair.About how many students will conclude that their coins are unfair?
Statistic Simulated Under the NullAbout 5% of the area is to the right of the gold line
An Error ProbabilityThe cutoff for the P-value is an error probability.If:your cutoff is 5%and the null hypothesis happens to be truethen there is about a 5% chancethat your test will reject the null hypothesis.
Origin of the Conventions
Sir Ronald Fisher, 1890-1962
“It is convenient to take this point [5%] as a limit in judging whether a deviation is to be considered significant or not.”–– Statistical Methods for Research WorkersSir Ronald Fisher, 1925
“If one in twenty does not seem high enough odds, we may, if we prefer it, draw the line at one in fifty (the 2 percent point), or one in a hundred (the 1 percent point). Personally, the author prefers to set a low standard of significance at the 5 percent point …”Sir Ronald Fisher, 1926
A/B Testing
Comparing Two SamplesCompare values of sampled individuals in Group A with values of sampled individuals in Group B.Question: Do the two sets of values come from the same underlying distribution?Answering this question by performing a statistical test is called A/B testing.

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• Fall '17
• Statistics, Null hypothesis, Statistical hypothesis testing, Statistical significance, Ronald Fisher, Sir Ronald Fisher

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