Editor's Note: APYs listed in this article are up-to-date as of the time of publication. They may fluctuate (up or down) as the Fed rate changes. CNBC Select will update as changes are made public.

Learn the distinctions between simple and stratified random sampling. Understand how researchers use these methods to accurately represent data populations.

The Fund seeks capital appreciation. Fidelity Management & Research normally invests at least 80% of the assets in securities of companies principally engaged in offering, using, or developing ...