RESEARCH METHODOLOGY

Detailed explanation-1: -Sampling bias occurs when some members of a population are systematically more likely to be selected in a sample than others. It is also called ascertainment bias in medical fields. Sampling bias limits the generalizability of findings because it is a threat to external validity, specifically population validity.

Detailed explanation-2: -What is sampling bias? Sampling bias is a type of survey bias that occurs when a research study does not use a representative sample of a target population. In other words, you gather data from a group in which some members of the intended population have a higher or lower sampling probability than others.

Detailed explanation-3: -Biased sampling is a method of forming a sample that favors certain values of the variable of study. A sample obtained from a biased sampling method is likely not representative of the entire population. Convenience sampling is a method of forming a sample by volunteers.

Detailed explanation-4: -A sample is representative if characteristics arise with the same percentages in the sample as in the population. A biased sample is not representative in an important way. A sampling frame gives you access to the population units so that a random sample can be chosen.