Chemistry Reference
In-Depth Information
By using chi-square x
2
, i.e.,
The expected value,
Where VT = Vertical Total
HT = Horizontal Total
GT = Ground Total.
Sample ID
Fe
Pb
Cr
Zn
Total
B. leaf (Ph Aba Road
2.96 (2.860)
0.220 (0.289) 0.030 (0.036) 0.890 (0.915) 4.10
B” Akpajo Etc.
3.43 (3.465)
0.405 (0.350) 0.052 (0.044) 1.08 (0.582) 4.967
B” Refinery and
Akpajo Road
3.27 (3.335)
0.350 (0.337)
0.041 (0.042) 1.12 (1.067) 4.781
Total
9.66
0.975
0.123
3.09
13.848
, ,
, =0.350,
, ,
, ,
To find the chi-square,
=
.
= 0.0035 + 0.0004 + 0.0013 + 0.0165 + 0.0086 + 0.0005 + 0.001+ 0.0015 + 0.0000 + 0.0007 +
0.4261 + 0.0026
X
2
= 0.4601.
At 1% significant level i.e., 0.01
1 - 0.01 = 0.99
d.f = (n-1) (m-1) = (3-1) (4-1)
= (2) (3) = 6
Degree of freedom = d.f = 6
X
2
0.99, 6 = 0.872
Decision: since X
2
= 0.4601 is less than the critical value - 0.872, the null hypothesis (HO) is
accepted and the alternative hypothesis (HI); is rejected.
Therefore, there is significant difference between B leaf (Bori) control and X
2
= 0.4601 at 1%
significant level.
