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11.1 Hypothesis Testing

11.1 Hypothesis Testing. Dependent Groups. Before/after or matching link. Many statistical tests involve paired data samples that help us draw conclusions abt the difference of 2 groups

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11.1 Hypothesis Testing

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  1. 11.1Hypothesis Testing Dependent Groups

  2. Before/after or matching link • Many statistical tests involve paired data samples that help us draw conclusions abt the difference of 2 groups • This freqly happens in before/after sits in which the same item is measured prior to and after a treatment • Ex= guided exercize 1 pg 453

  3. Sometimes there is a matching link, a natural match for collecting the pairs even without a before/after feel • Feet Data

  4. So What? • Advantages= • Using matched data can often reduce the danger of extra factors except for the 1 characteristic we want to measure (blocking) • Pairing data reduces variance, thus increasing the accuracy of our results. • See diamond middle of pg 453

  5. d bar is the mean difference betw the paired/matched data…it’s a sample mean…an x bar • S sub d is the sample standard deviation • The remainder of this hypothesis test is already familiar to you, if you like t distributions

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