Statistics for Environmental Engineers

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Results for Comparative Tests of Methods A and B


Nitrate


NO3 (mg/L)


Average NO3


Level


Method


PMA


У1


У2


У (mg/L)


Low


A


None


2.9


2.8


2.85


High


A


None


26.0


27.0


26.50


Low


B


None


3.1


2.8


2.95


High


B


None


30.0


32.0


31.00


Low


A


Yes


2.9


3.0


2.95


High


A


Yes


28.0


27.0


27.50


Low


B


Yes


3.3


3.1


3.20


High


B


Yes


30.4


31.1


30.75


TABLE 30.2


Design Matrix Expressed in Terms of the Coded Variables


Nitrate


Level


Method


PMA Level


ln(NO3)


Average


Variance


*1


*2


*3


*1


*2


x


2


s


-1


-1


-1


1.0647


1.0296


1.0472


0.0006157


1


-1


-1


3.2581


3.2958


3.2770


0.0007122


-1


1


-1


1.1314


1.0296


1.0805


0.0051799


1


1


-1


3.4012


3.4657


3.4335


0.0020826


-1


-1


1


1.0647


1.0986


1.0817


0.0005747


1


-1

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