I have to make an chemistry study about the lead (Pb, plumbum) contained by tomatoes inside a tomato farm, but I'm having throuble to estimate the sample size. Is there any formula to calculate the sample size?(asuming that i have to):
- Pick the tomatoes samples from the farm.
- Identify the tomatoes kind (not relevant for the lead measurement).
- Measure the lead in the tomatoes selected.
- Compare the measurements with the maximun lead allowed.