**12. The significance of choosing an effective method of sampling**

Sampling determines the outcome of analysis. However, with the variations that may be present between the population and the sample, there may be errors in the sample (**Figure 10**).

*Sampling bias* happens because certain members of the population are more likely to be included in a survey than others. It is often referred to as determination bias in medical fields. *Sampling frame error* occurs when a sample is having a certain type of possible respondent relative to the population of interest. *Systematic errors* mostly affect the precision of the calculation. It is of prime importance to use the most appropriate and useful form of sampling to attain accurate outcome of research.

**Figure 10.**

*Sources of error (source: https://creativemaths.net/blog/sampling-and-non-sampling-error/).*
