List 2 probability sampling techniques
1. Simple Random Sampling: In this technique, every unit in the population has an equal chance of being selected. Random numbers or a random number generator are usually used to select the sample. This technique ensures that every individual in the population has an equal opportunity to be included in the sample.
2. Stratified Sampling: In this technique, the population is divided into different subgroups or strata based on certain characteristics such as age, gender, income level, etc. Then, a random sample is selected from each stratum proportionate to its size in the population. Stratified sampling ensures that each subgroup is represented in the sample, allowing for more accurate analysis when studying differences between subgroups.