try and errorttt plotttt transformtukey kramer intervaltwicingtwo armed bandit problemtwo by two tabletwo sample median testtwo sample problemtwo series theoremtwo sex problemtwo sidedtwo sided testtwo stage designtwo stage least squarestwo tailedtype 1 errortype 2 frequency distributiontype biastype i and type ii variablestype i errortype ii errortype iii and type iv errorstypes of regression modelstypical valuetypology