Question

pushpin, a social networking site, sent out a survey to all female users. one of the questions in 2014 was, \do you cook dinner every day?\ more than 35,000 women responded, with 38% responding yes. what can you conclude from the survey?
the poll used stratification, so the results tell us little about the population of all adults.
about 38% of women cooked dinner every day in 2014.
undercoverage occurred, so the results tell us little about the population of all adults.
the sample is too small to draw any conclusions.
none of the previous answers is correct.

Explanation:

The survey was only sent to female users of Pushpin, excluding males and non-users of the site. This undercoverage means the sample is not representative of all adults, so results cannot generalize to that broader population. The first option is wrong because stratification wasn't used; the third misrepresents the result (38% of respondents, not all women); the fourth is wrong as the sample size (35,000) is large, just unrepresentative.

Answer:

Undercoverage occurred, so the results tell us little about the population of all adults.