HP provides a type of model name near the keyboard or screen, but this name or number is probably not sufficient to get proper support for your computer. These names or numbers often represent a series of many notebook computers that look similar, but have different options and parts.
Fundamentally, river sampling is a web-based convenience sample of opt-in participants that uses a quota sampling approach to build a study sample. The selection method is not probability based, and participants cannot be described as representing any larger defined population.
cluster sampling a type of probability sampling in which the population is divided into groups on the basis of some shared characteristic (such as hospitals grouped by geographic region) and a random sample is drawn from each of these groups. convenience sampling accidental sampling.