Delany wants to find out the way her friends are spending their summer vacation. she surveys a large number of students at a movie theater about their favorite summer activity. the results of her survey are shown on the table below.
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delany bases her conclusion on the results of her survey. she concludes that the favorite summer activity of most students is watching movies. which statement best describes delany's conclusion?

a. delany's conclusion is not valid because she surveyed only students.
b. delany's conclusion is valid because she surveyed a large number of students.
c. delany's conclusion is valid because she surveyed students from many schools.
d. delany's conclusion is not valid because she surveyed students at a movie theater.

forever 21 is a local clothing store for teens. on saturday a journalist for a teen magazine surveyed teenagers leaving this clothing store to determine which brand of clothing they like best. which statement best explains why the results of this survey may not be valid?

a. the survey could have been conducted online.
b. the group surveyed consisted only of teenagers
c. the survey was conducted by a journalist from only one magazine.
d. the group surveyed consisted only of teenagers who shopped at the forever 21.