What is a representative​ sample, and why is it​ important?

A representative sample allows researchers to abstract the collected information to a larger population. Most market research and psychological studies are unsuitable in terms of time, money, and resources to collect data on everyone.

Some stress reducing strategies that a lot is: aromatherapy, yoga, meditation, quiet walks in the park, or listening to relaxing music.

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.