The major U.S. TV networks rely on surveys to tell them how many and what type of people watch their programs.

The major U.S. TV networks rely on surveys to tell them how many and what type of people watch their programs. The Nielsen Company surveys viewers using “people meters.” The following is an extract from an article about these meters in the Wall Street Journal. Prior to this extract the article had praised the fact that Nielsen selected their homes at random.“The people meter works like a remote control. Each viewer presses some buttons when he or she starts or stops watching TV. When the set is on, a separate meter automatically records the channel the set is tuned to. But even if the set is turned on, what matters most is that someone has pressed buttons showing that there’s really a viewer, or several viewers. Even the youngest tots are expected to use the gizmo when they tumble out of bed at dawn for Saturday cartoons.”“For adults, too, this is an onerous burden of button-pushing, especially when a Nielsen home is expected to do it diligently for up to two years. That may be why almost half of homes refuse when Nielsen asks them to join its people meter sample, and why only 47% stay on as members of the Nielsen system.”Explain why the lack of cooperation may distort the random nature of the selection procedure that the system needs to represent an entire nation’s viewing.