PSY201 9.30.13 To Post

# Populaon 1 maltreated children populaon 2 children

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Unformatted text preview: Don of means for PopulaDon 1, shade the region more extreme this Z score; this shaded region shows the power of the study 4.  Using the normal curve table, determine the probability (percentage) of geeng a score more extreme than that Z ­score a)  That percentage = power b)  Beta is the opposite of power (β = 100%  ­ Power) 6 9/29/13 We plan to conduct at study about maltreatment and telomere length and want to know our study’s power to detect the predicted eﬀect. In other words, we want to know the probability that we will ﬁnd a sta6s6cally signiﬁcant result, if the research hypothesis is true. [email protected] 1: Maltreated children. [email protected] 2: Children, in general, with no maltreatment. Research hypothesis: Maltreated children will have shorter telomere length than non ­maltreated children. μ1 < μ2 Null hypothesis: Maltreated children and non ­maltreated children will not diﬀer in their telomere length. μ1 ≥ μ2 1.  Gather the needed informaDon: a)  The mean and standard deviaDon of Pop 2’s distribuDon of means (the comparison distribuDon) ▪  You know that populaDon of children in general (without maltreatment history) have a mean of μ = 1.20, and a standard deviaDon of σ = .98. Let’s say for this study, you are planning to collect a sample of N = 36 maltreated children. ▪  These are the parameters for the populaDon of individuals… need to know the parameters for the distribuDon of means μM = μ = 1.20, σM = σ/√N = .98/√36 = 0.16 1.  Gather the needed informaDon: a)  The mean and standard deviaDon of Pop 2’s distribuDon of means (the comparison distribuDon) μM = μ = 1.20, σM = σ/√N = .98/√36 = 0.16 b)  The predicted mean...
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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.

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