Transcription of Sample Size - vanbelle.org
{{id}} {{{paragraph}}}
Example: quiz answers
Sample Size - vanbelle.org
2 SampleSizeThe rstquestionfacedbya statisticalconsultant,andfrequentlythela st,is, Howmany subjects(animals,units)doI need? , TypeII error, andone sidedversustwo questionistosettlethetypeofvariable(endp oint)theconsulteehasinmind:Isit continuous,discrete,orsomethingelse?Forc ontinuousmeasurementsthenormaldistributi onisthedefaultmodel,fordistributionswith binaryoutcomes, samplesizecalculation,foroneortwo groups,are:TypeI Error( )Probabilityofrejectingthenullhypothesis whenit is trueTypeII Error( )Probabilityofnotrejectingthenullhypothe siswhenit is falsePower=1 Probabilityofrejectingthenullhypothesisw henit is false 20and 21 Variancesunderthenullandalternative hypothe ses(maybethesame) 0and 1 Meansunderthenullandalternative hypothesesn0andn1 Samplesizesintwo groups(maybethesame)Thechoiceofthealtern ative hypothesisis they knew thevalueofthealternative hypothesis,they wouldnotneedtodothestudy. Thereis alsodebateaboutwhichis thenullhypothesisandwhichis the2728 SAMPLESIZEPS fragreplacementsH0: 0 1= 0H1: 0 1= 0 =2 =2S:E:= q2nS:E:= q2nR CriticalValuePower= 1 y0 y1|{z} |{z}0+z1 =2 q2n z1 sidedalternative,equalvariancesundernull andalternative , siteis safeorhazardousasthenullhypothesis?
28 SAMPLE SIZE PSfrag replacements H0: 0 1 = 0 H1: 0 1 = 0 =2 =2 S:E:=˙ q 2 S:E:=˙ n q 2 n R Critical Value Power=1 y 0 y 1 | {z } |{z} 0+z1 =2˙ q 2 n 2z1 ˙ q n Fig. 2.1 Sampling model for two independent sample case.
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document:
Related search queries
WRITING AN EFFECTIVE RESEARCH PROPOSAL, Proposal, Study, Case Study Proposal, Sample Qualitative Research Proposal Published by, RESEARCH PROPOSAL FORMAT INTRODUCTION, RESEARCH PROPOSAL FORMAT INTRODUCTION Background, US/Mexico Border Crossing Card BCC, Case, Value Engineering, CASE STUDY, STUDY DESIGN, Sample Research Proposal with Comments