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.
Carrier signal can be defined as a high frequency signal that is modulated by the modulating or the information signal. This carrier signal increases the range and distance the information signal can travel. Along with the distance carrier signal also improves the signal quality. To understand this we can consider a carrier signal as some bus, train, an aeroplane or any transport vehicle i.e. a carrier of some sort and the information signal as the passengers of the carrier. See it this way, a person can walk comfortably for a few kilometers.