Manure added farms

Non-manure farms

Mean

212.8

107.8

Variance

77.7

97.2

Observations

5

5

Hypothesized Mean Difference

0

df

8

t Stat

17.75331245

P (T ≤ t) one-tail

5.18508E−08

t Critical one-tail

1.859548038

P (T ≤ t) two-tail

1.03702E−07

t Critical two-tail

2.306004135