SCAN0006

# SCAN0006 - Case 2 T-test to compare two data sets with the...

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Unformatted text preview: Case 2. T-test to compare two data sets with the SAME method First check F If s1 and 32 are similar at 95% CL then: x, — xz‘ l "in: paulzd ”1 + “2 where S = 5l2(”i_1)+322(n2_1) ”WM nl+nz—2 If tcm > ttable then data sets are different at the 95% CL The F—test: which t—test is appropriate for comparing two sets of data? In order to use the more simple t-test, the standard deviations of both populations must be similar Use the F-test for this assessment Fcalc = 822/ 812 If Fcalc> Ftahle the standard deviations at the \9 populations are signiﬁcantly different and the more complex t—test should be used Eq 4-83 and 4-98 Table 4‘s Masses at gas isolated by Lord Rayﬁeégh Fit-(3m chem Emu; néx' égi 2.3m i? 1...,9‘} M} 2.2% W 2298 8‘) Auragc 2.31!) l l 23.99 :17 Standard deviation *»._t....._. 0.000 14; (mm 33 if” {L haw», 1 mm rat 1990, n3. a mum A (mm m ms. 75. ”2.: ...
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