7lna9c14 - Psyc 305 Week 10 Hypothesis Testing Goals for...

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Psyc 305 Week 10 Hypothesis Testing
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Goals for Today’s Class At the end of the class you should: Understand and be able to do all the steps in testing a hypothesis. Understand the term “statistically significant”. Understand what a “p-value” is. Understand how what we’ve done today relates back to issues from earlier in the semester.
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Logic of Science theory (deduction/ prediction) hypothesis IVs, DVs, operational definitions, controls experiment interpretation (induction) (statistical inference) data
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KEY POINTS Any piece of data, any fact, is consistent with an infinite number of hypotheses/theories about the world. It is also inconsistent with an infinite number of hypotheses/theories about the world.
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The Null Hypothesis The simplest theory -- there are no differences and nothing matters and nothing is related to anything else. Kind of depressing, no? (Tho actually… )
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Hypothesis Testing In a sense, when we do hypothesis testing, we ARE doing a crucial experiment. We are choosing between: our Research Hypothesis (that something matters or will make a difference or is related to something else) and the Null Hypothesis (that there is no difference or things don’t matter or are not related to anything else)
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Formulating Hypotheses Watching sexually explicit television when young will have no relation to quality of later romantic relations. (r = 0) Strength of relationship with parents is not related to likelihood of having an eating disorder. (r = 0) Null Hypotheses Research Hypotheses
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Formulating Hypotheses (with experiments can specify means) Caffeine has no effect on performance. μ caffeine = μ none Generate/Read -- who cares; it makes no difference. μ gen = μ read The new therapy / drug doesn’t help at all. μ new = μ traditional Null Hypotheses Research Hypotheses
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*Hypothesis Testing Decisions* We are trying to determine the truth out there in the world... REAL WORLD (what we don’t know but want to find out) OUR DECISION How can we be right?
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