t test for independent groups

t-test for independent groups Mike Arieh P. Medina

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t-test for independent groups

Mike Arieh P. Medina

River 1 & 2 BOD1 2

5 3

8 5

7 2

8 3

River 1 River 2

Is there a significant difference between River 1 and River 2 in terms of BOD at 0.001?

River 1 & 2 BOD1 2

5 3

8 5

7 2

8 3

Sum 35 13

Sum of Square 251 47

N 5 4

Mean 7 3.25

SS 6 4.75

River 1 River 2

t-test formula

df (degree of freedom)

• N1 + N2 – 2 = 7

Download t-table

http://www.mikeraulin.com/graziano8e/statistics/tables/T-tab.pdf

Interpretation

• Accept Ho if tcomputed < ttabular

• Reject Ho if tcomputed > ttabular

• Accept H1 if tcomputed > ttabular

• Reject H1 if tcomputed < ttabular

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