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SCAN0014 - 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 51 and 52 are similar at 95% CL then: .761 — 1:: train: = Spmhd "lnz ”I + n: where K = 512(n1—1)+S§("2-1) ”a” nl+n2 2 If tfi,Ic > tWe 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/ 312 If Fcalc> Ftable the standard deviations ofthe populations are significantly different and the more complex t-tesl should be used Eq 4~83 and 4-93 Mole 4—3 Masses a? gas isolated by Lord Ruyletgh §~'mm rim-mica! me flit“ {3;} 2.301 32 2.298 {)9 2299 s10 “ )3 4‘) 2.298 5') Aw ”age 2.3i 0 ll .3299 47 Stunthml :k‘viatiuu (mm 38 E? V Ill (09!). ’ Z mar (1mm 51.1. 1908. E5 2:. ...
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