Statistics for Environmental Engineers

Скачать в pdf «Statistics for Environmental Engineers»

79884


83716


Mar


70185


67380


Mar


75395


77861


Apr


76514


78533


Apr


74362


76132


May


71019


68696


May


74906


81796


Jun


70342


73006


Jun


71035


84288


Jul


69160


73271


Jul


76591


82738


Aug


72799


73684


Aug


78417


85008


Sep


69912


71629


Sep


76859


74226


Oct


71734


66930


Oct


78826


83275


Nov


73614


70222


Nov


73718


73783


Dec


75573


76709


Dec


73825


78242

31.4    Rounding. Express the data in Exercise 31.3 as thousands, rounded to one decimal place, and recalculate the correlation; that is, the Jan. 1999 BOD becomes 68.3.


31.5    Coliforms. Total coliform (TC), fecal coliform (FC), and chlorine residual (Cl2 Res.) were measured in a wastewater effluent. Plot the data and evaluate the relationships among the three variables.


Cl2 Res. (mg/L)


ln(TC)


ln(FC)


Cl2 Res. (mg/L)


ln(TC)


ln(FC)


Cl2 Res. (mg/L)


ln(TC)


ln(FC)


2.40


4.93


1.61


1.80


5.48


1.61


1.90


4.38


1.61


1.90


2.71


1.61


2.90


1.61


1.61


2.60


1.61


1.61


1.00


7.94


1.61


2.80


1.61

Скачать в pdf «Statistics for Environmental Engineers»