7.6 2 pop variances - ”er exact F’Tfié’i 01 mm ‘...

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Unformatted text preview: ”er exact F’Tfié’i 01%!) mm ‘ |nference about two population variances with independent samples Requiredconditions:anmom Glhd Hide 600mm Wimplfié. rommiiang are (A max. normmug (AlélllblflCd Ho: 012 = 022 2 Ha: 012 > 022 Test Statistic: F = E;- Reject Ho if: F > Fu,n1.1,nz-1 2 2 Ha: 012 < 022 Test Statistic: F = :—§ Reject Ho if: F > Fa, "2.1, nm 1 H3: 012 at 022 Test Statistic: F = ————larger variance Reject Ho if: F > Fan, df for mm, df for denom smaller variance Ex: Samples were taken of order-to—delivery times (in days) for a 10 lb package from India and China to the US. India: 25.2 14.9 24.1 15.7 9.8 35.8 44.2 25.4 14.9 27.1 China: 21.5 6.8 7.0 12.2 15.6 13.7 18.9 19.4 10.5 #l ls ther silfficient evidence to conclude that the variances in order-to-delivery times for India I" and China shipments differ at the 5% significance level? ‘ l. Ho=03=crf 2 2 : 0" ‘7‘ 0“ _ H01 I 2 abeogzo‘l‘“ “I” ‘0 9|: “Lia's 2. RBJBOT “0 ‘f F) F.025JIO‘l’q-l n3: 0‘ 92: $.3t‘3 Dam“ F > FoasJ alJ a F 7 tab that; 3. F: l0.5la’ : 5.3%“ Lt. The“? '9 “01 enou - variances m Omegbrgymonot to conclude the and China onipmems di 1?:wa Times "V” ”WHO?...
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