SECTION 15.17 TESTING FOR THE DIFFERENCE BETWEEN MEANS

This tests whether the means from two samples are different. The test is asymptotically valid if the underlying distributions have finite first two moments; the test statistic is approximately t- distributed. The MAIN program should include

COMMON/BPRINT/IPT,NFILE,NDIG,NPUNCH,JPT,MFILE CALL DFLT

The call is

CALL TESTMEAN(A1,A2,N1,N2,TVAL)

where

A1 = a DOUBLE PRECISION array dimensioned A1(N1) which contains the values of the first sample (input) A2 = a DOUBLE PRECISION array dimensioned A2(N2) which contains the values of the first sample (input) N1,N2= sizes of the two samples (input) TVAL = DOUBLE PRECISION scalar which will contain the calculated t-value (output)

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