7.2 2 pop means - (Dl€d Required conditions Small sample...

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Unformatted text preview: '(Dl€d Required conditions: Small sample: TWO random X lthP. Wimplfifo lmFCn 90m WPUImnang hOWG x novmmt dieing/Hang int; popuioman wmmnuffa (MC (Iowan (OHM) mm mm WI“ b0 0 _— _ __ 2 _ 2 H0: H1 =l12 Test Statistic: T=Gfi *2) Do 5; = —_("I “WW 1352 $5 n1+n2"2 Ha: H1 > 112 Reject Ho if: T > Ta'df Ha: pl < u; Reject Ho if: T < ‘Ta’df df= n1+ n2 -2 Ha: 111 at Hz Reject Ho if: |T| > Tum“ ' . —- — 2 1 1 Confidence Interval. x1 -x2 iTQIMf ’31, ("—1+ Ex: ‘Indpt random samples of coffee tables from approximately normal populations were taken. Sample 1 (brand A) had 15 obs, a mean of 43.6 inches and 3 st dev of 5.475; sample 2 (brand B) had 16 obs, a mean of 53.625 inches and 3 st dev of 5.414. Gonstruct a 90% confidence interval for the difference in mean length of coffee tables between brand A and brand B. Interpret your answer. '" I 1 -L. If/‘l-L—w 1Toc/1de (91);}: n1 T-05Jl51|b’):)q (4% r Q91")!9.‘[email protected]::flg:l)(‘)fll1)2 Mrlb —;) "bqq 9?): mm +319 — 93b); 1 quq “Fax ‘[ 241032 F) t i 10.0.15 1 6.7911 ~13.th J "bJDI we are Clo'/- confident m “if, method ueed the difference m mean length of coffee/melee mvm momcl A and brand B {01% loiwn 192.9914 andjhiol mam ...
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