monfils 418_test 2 review-2

monfils 418_test 2 review-2 - Sta$s$cs and research design...

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Sta$s$cs’and’research’design’ Exam’2-’review
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A’few’announcements’ Upcoming’exam’
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Topics’covered:’ Correla$on;’Regression’ Hypothesis’tes$ng’ Z-test’ t-tests’ Confdence’intervals’
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What’factors’aFect’our’decision’about’H 0 ?’ n Whether’we’reject’the’null’depends’on’ several’factors:’ 1. The’actual’obtained’diFerence’( X - μ ) 2. The’size’of’the’sample’variance’(s 2 )’ 3. The’sample’size’(N)’ 4. The’alpha’level’( α )’ 5. Whether’the’test’is’1-tailed’or’2-tailed
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How’you’might’approach’problems:’ Informa$on’extrac$on’ Problem’iden$Fca$on’ Planning’(draw’a’sketch)’ Problem’solving’(calcula$ons/decision)’
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If’the’mean’of’your’sample’is’92,’and’the’standard’error’of’the’ mean’(of’the’popula$on)’is’1.7,’with’a’degree’of’conFdence’of’ 99%,’what’is’the’interval’within’which’the’popula$on’mean’ will’be?’
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’ CI’=’X’±’ z(σ x )’ If’the’mean’of’your’sample’is’92,’and’the’standard’error’of’the’ mean’(of’the’popula$on)’is’1.7,’with’a’degree’of’conFdence’of’ 99%,’what’is’the’interval’within’which’the’popula$on’mean’ will’be?’
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’ CI’=’X’±’ z(σ x )’ If’the’mean’of’your’sample’is’92,’and’the’standard’error’of’the’ mean’(of’the’popula$on)’is’1.7,’with’a’degree’of’conFdence’of’
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monfils 418_test 2 review-2 - Sta$s$cs and research design...

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