Suppose that the population proportion of Internet users who say that they use T

Question

Suppose that the population proportion of Internet users who say that they use Twitter or another service to post updates about themselves or to see updates about others is 19%. Think about selecting random samples from a population in which 19% are Twitter users.

If you select three people the sample space is { TTT, TTTc, TTc T, Tc TT, TTc Tc, Tc TTc, Tc Tc T, Tc Tc Tc}.

Let X be a random variable that expresses the number of Twitter users in the sample of size 3. Identify the correct sample space for X.


{0, 1, 2, 3} {3, 2, 2, 2, 1, 1, 1, 0} {1, 2, 3} eBook

Explanation / Answer

Here for  { TTT,  TTTc,  TTc T,  Tc TT,  TTc Tc,  Tc TTc,  Tc Tc T,  Tc Tc Tc}. the X can have values {0,1,2,3} and this is the sample space

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