Hospital Name

Al-Shifa

EGH

N

Mean

Std. Deviation

N

Mean

Std. Deviation

Free Residual Chlorine (mg/l)

28

0.0

0.0

26

0.2

0.05

t = 16.32

p value = 0.000

pH value

28

7.1

0.3

26

8.0

0.20

t = 12.34

p value = 0.000