Answer:
Sources of experimental uncertainties
1. Environment- change in environment can bring about experimental error e.g change Temperature can affect crop yield.
2. Wrong caibration of equipment- some equipment need to be calibrated before use. Wrong calibration brings error
Explanation: steps to uncertainties
1.Calibrate equipment when necessary.
2. Ensure fomulars are rightly imputed for electronic devices
3. Experience and competency is needed to avoid Esperanza uncertainties. Expert can be employed
4. Replication for field work reduces uncertainties. E.g maize of the same varieties can be planted in three places on the field to avoid uncertainties.
