# Connexions

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Inside Collection (Textbook):

Textbook by: Barbara Illowsky, Ph.D., Susan Dean. E-mail the authors

# Summary of Formulas

 If HoHo has: equal (=)(=) greater than or equal to (≥)(≥) less than or equal to (≤)(≤) then HaHa has: not equal (≠)(≠) or greater than (>)(>) or less than (<)(<) less than (<)(<) greater than (>)(>)

If α α p-value, then do not reject H o H o.

If α > α> p-value, then reject H o H o .

αα is preconceived. Its value is set before the hypothesis test starts. The p-value is calculated from the data.

αα = probability of a Type I error = P(Type I error) = probability of rejecting the null hypothesis when the null hypothesis is true.

ββ = probability of a Type II error = P(Type II error) = probability of not rejecting the null hypothesis when the null hypothesis is false.

If there is no given preconceived αα, then use α=0.05α=0.05.

## Types of Hypothesis Tests

• Single population mean, known population variance (or standard deviation): Normal test.
• Single population mean, unknown population variance (or standard deviation): Student's-t test.
• Single population proportion: Normal test.

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