PSY201 9.20.13 To Post

# 581 8 1058 upper cuto x 2581 8 542 lower

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Unformatted text preview: been conver4ng our raw score to a Z score, and checking whether it is above or below our cri4cal value   AlternaIvely, we could convert our criIcal Z score to a criIcal raw score, and use that to determine whether to reject the null hypothesis ▪  Diﬀerent way of coming to the same conclusion!   4. Determine your sample’s score on the comparison distribuIon (μ = 8, σ = 1)   Z = (X – μ)/SD = (10.2 – 8)/1 = 2.2   CriIcal Z = ±1.96   Convert to the raw score: X = Z(SD) + μ ▪  X = +1.96(1) + 8 = 9.96 (upper cut ­oﬀ) ▪  X =  ­1.96(1) + 8 = 6.04 (lower cut ­oﬀ)     Z score of 2.2 > criIcal Z value of ±1.96 Raw score of 10.2 > criIcal raw value of 9.96 15 9/19/13   SomeImes, researchers choose to use a more conservaIve test by using a smaller p ­value   Makes it harder to reject the null hypothesis ▪  Which in turn gives us more conﬁdence that we are correctly rejecIng the null hypothesis when our results meet the speciﬁed criteria   Let’s look at the same example using a p < .01   3. Determine...
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