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PSY32 - Lecture 12

# PSY32 - Lecture 12 - Today Admin Nada Hypothesis Testing II...

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Today *Admin *Nada *Hypothesis Testing II Joys of Hypothesis Testing *What is a hypothesis? *Difference between alternative and null hypothesis? *Why can we never prove a hypothesis to be true? *Research question: Does smoking contribute to weight gain or loss? *Here are my alternative and null hypotheses: *H 1 : Smokers don’t weigh the same as nonsmokers. *H 0 : Smokers and nonsmokers weigh the same. H 0 : Smokers and nonsmokers weigh the same. *What do you conclude about the H 0 ? What is Hypothesis Testing? *It is a decision making process—involves determining if you are dealing with one or more populations *Two or more populations if you reject the null hypothesis *One population if you fail to reject the null Steps * Formulate the H 0 and H 1 * Choose your α: p < .05 is common *Collect the data *Calculate the statistic * Apply the decision rule to either accept or reject the H 0 *If the expected difference only goes in one direction then a one-tailed significance test is used. *H1: Males weigh more than females *If the expected direction is unspecified then two-tailed significance tests are used.

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