Examlex
Middle-ear infections become __________ frequent in middle childhood because the Eustachian tube becomes __________.
United States
A country in North America consisting of 50 states and a federal district, known for its democratic government and multicultural population.
Random Sample
A method of selecting a sample from a statistical population in such a way that every possible sample has a predetermined probability of being selected.
Polling
The process of surveying people's opinions or intentions, often used in predicting election outcomes.
Cell Phones
Portable electronic devices that allow users to make phone calls, send text messages, and access various applications and the internet.
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