Question

identifying valid, non - biased sampling methods
inga, kai, and jason volunteer in the school library. they want to find the average number of pages of a library book. it would be unreasonable to calculate the number of pages in every book to find the average. they decide they need to find a valid sample.

• inga suggests choosing 100 books from the history section to get a sample.
• kai suggests randomly selecting 100 books from the library’s entire catalog.
• jason suggests using 100 books from the teen fiction section to get a sample.

who suggested the best way to produce a random sample that is not biased?
______ suggested the best way to produce a random sample that is not biased.

Explanation:

A valid, non-biased sample must represent the entire population (all library books). Inga's sample only uses history books, and Jason's only uses teen fiction—both are limited to a single section, so they are biased and not representative of all books. Kai's method randomly selects from the entire catalog, which ensures every book has an equal chance of being chosen, making the sample representative and non-biased.

Answer:

Kai suggested the best way to produce a random sample that is not biased.