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.
Census vs. Sampling. Surveys can gather information through different methods of observation. However, most surveys employ a questionnaire to measure specific characteristics of the population. There are two main ways to gather this information. A census survey collects complete information from all participants in the population. General criteria of a census survey include: 1  Establish and maintain a complete list of the primary sampling unit (PSU) components. 2  All members of the PSU in the fishery must be included. 3  Validation (used to correct for missing and misreported data)  Enforceable and enforced.