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scan0049 - 5 l 5 Two brands of water filters are to be...

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Unformatted text preview: 5 l 5. Two brands of water filters are to be compared in terms of the mean reduction in impuri— ties measured in parts per million (ppm). Twenty—one water samples were tested With each filter and reduction in the impurity level was measured, resulting in the following data: Filter 1 : 71.1 : 217171 : 8.07 8% : 4.5 Filter 2 : 722 = 21, f2 : 6‘5, 3% : 2.0 ‘ (a) Perform the test of equality of variances with a = 0.05‘ ( 7 points) (NOW 3 f20,20,0.95 : 2-124; f21,21,0.95 = 2-0847 f22,22,0,95 = 2048 f20,20,0.975 : 2-4647 f21,21,0.975 = 2-4087f222210975 : 2-358 ) (b) 'I‘est if M : #2 with oz 2 0.05.( 8 points) ...
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