Question

thirty random people at a coffee house in new york city were asked what their favorite coffee drink is: espresso (e), cappuccino (c), americano (a), or some other drinks (o). do you think this would be a representative sample for all new yorkers? why or why not?

the sample is representative since the sample is random.
the sample is representative since only one coffee house was chosen.
the sample is representative since people of different sex, age, social and economic status were asked.
the sample is not representative since all the respondents were customers of the coffee house.

Explanation:

A representative sample should reflect the whole population. Here, respondents are only coffee - house customers, which excludes non - coffee - house - going New Yorkers. Random sampling within a coffee house doesn't represent all New Yorkers, choosing one coffee house limits scope, and “different sex, age, etc.” in a coffee house still doesn't cover all New Yorkers. So the sample is not representative as all are coffee - house customers.

Answer:

D. The sample is not representative since all the respondents were customers of the coffee house.