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Unformatted text preview: el, what should the researcher conclude, assuming that we know that the general populaIon has the following populaIon parameters: μ = 8, σ = 1 ? 1. Restate the quesIon as a research hypothesis and a null hypothesis about the populaIon ▪ Popula4on 1: People in the polluted region ▪ Popula4on 2: People in general Research hypothesis: The amount of sleep reported by people in the polluted region will diﬀer than the amount of sleep reported by people in general. Null hypothesis: There will be no diﬀerence in the amount of sleep between people in the polluted region and people in general. 12 9/19/13 2. Determine the characterisIcs of the comparison distribuIon Comparison distribu4on Normal distribuIon Sleep amount in general Assume μ = 8, σ = 1 3. Determine the cutoﬀ sample score on the comparison distribuIon at which the null hypothesis should be rejected (p < .05) 3. Determine the cutoﬀ sample score on the comparison distribuIon at which the null hypothesis should be rejected (p < .05) 13 9/19/13 For 5% probability (boNom 2.5% and top 2.5% of comparison distribu4on), needed is below –1.96 or above +1.96 4. Determine your sample’s score on the comparison distribuIon (μ = 8, σ = 1) Z = (X – μ)/SD = (10.2 – 8)/1 = 2.2 5. Decide whether to reject the null hypothesis Z score = 2.2 > criIcal value of +1.96 So we can reject the null hypothesis ▪ Our results support the research hypothesis Z score of 2.2 > criIcal value of +1.96 14 9/19/13 4. Determine your sample’s score on the comparison distribuIon (μ = 8, σ = 1) Z = (X – μ)/SD = (10.2 – 8)/1 = 2.2 ▪ We have...
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This note was uploaded on 03/24/2014 for the course PSY 21201 taught by Professor Bernard during the Winter '13 term at SUNY Stony Brook.
 Winter '13
 bernard
 Psychology

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