Identify the sampling technique used to obtain this sample:

Each person boarding a plane is asked to flip a coin; those showing “tails” have their luggage searched.

Isn't that a simple random sampling?

http://en.wikipedia.org/wiki/Sampling_(statistics)#Simple_random_sampling

hmmmmm i guess it is....thank u :)

The sampling technique used to obtain this sample is called "random sampling" or "random sampling with a restriction".

To explain how we arrived at this conclusion:

In this scenario, the sampling is done at the time when people are boarding a plane. Each person is asked to flip a coin, and those who show "tails" (i.e., the outcome of the coin flip is tails) have their luggage searched.

Random sampling involves selecting a random subset from a larger population. In this case, each person boarding the plane is given an equal chance to be selected for luggage search by flipping a coin. This randomness helps ensure that the sample obtained is representative of the larger population of people boarding the plane.

However, it's important to note that this sampling technique has a restriction, meaning that only those who show "tails" are chosen for the sample. This restriction is an additional step that is not part of the traditional random sampling technique, where all individuals have an equal chance of being included in the sample.

To summarize, the sampling technique used here is random sampling with a restriction, where the restriction involves selecting people for luggage search based on the outcome of a coin flip.