Skin discoloration can be due to changes in melanin. Melanin is a skin pigment that gives color to the skin. Changes in melanin can also cause skin to be patchy.
Probability sampling, or random sampling, is a sampling technique in which the probability of getting any particular sample may be calculated.Nonprobability sampling does not meet this criterion and, as any methodological decision, should adjust to the research question that one envisages to answer.ampling is the use of a subset of the population to represent the whole population or to inform about (social) processes that are meaningful beyond the particular cases, individuals or sites studied.
Definitions A sample is the group of people who take part in the investigation. The people who take part are referred to as âparticipantsâ. Sampling is the process of selecting participants from the population.The target population is the total group of individuals from which the sample might be drawn. Generalisability refers to the extent to which we can apply the findings of our research to the target population we are interested in. sample is the group of people who take part in the investigation. The people who take part are referred to as âparticipantsâ. Sampling is the process of selecting participants from the population. The target population is the total group of individuals from which the sample might be drawn.