Also referred to as quota control, it is a method of selecting subjects for a study. The subjects are already chosen for specific characteristics such as age, sex, education, etc.The quota sampling assures the proper proportion of these traits in the group.lso referred to as quota control, it is a method of selecting subjects for a study. The subjects are already chosen for specific characteristics such as age, sex, education, etc.
In contrast, a broadband signal is a signal which does not occupy the lowest range, but instead a higher range, 1MHz to 3MHz, for example. A wire may have only one baseband signal, but it may hold any number of broadband signals, because they can occur anywhere in the spectrum.
Baseband signals can be composed of a single frequency or group of frequencies or in the digital domain composed of a data stream sent over an unmultiplexed channel. Examples of an analog baseband signal may be audio or composite video. Examples of a digital baseband signal may be Ethernet signals operating over a Local Area Network (LAN). Signals of a baseband nature often are modulated, or multiplexed, with other signals to form a composite signal.