
Figure 1: The Map of Study Area (Buea and Limbe) - Fako –Division South West Region
Where σ is the assumed standard deviation of each group (assumed to be equal for both groups)
Zcrit Value is the standard normal deviate for the desired significance level (1.96, corresponding to a significant value of 0.05)
Zpwr value is the standard normal deviate for the desired statistical power (0.34 or 1.28, are typically used corresponding to a power of 80% 0r 90% respectively)
And D is the minimum expected difference between the two means.



Tables at a glance
Figures at a glance