PSY201 9.20.13 To Post

# 2 81 22 we have been conver4ng our raw score to a z

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

## 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.

Ask a homework question - tutors are online