Question 25 of 30 (1 point) Attempt 3 of 3 7.4 Section Exerci A federal report indicated that 21% of children under age 6 live in poverty in United States, an increase over previous years. How large a sample is needed to estimate the true proportion of children under age 6 living in poverty in United States within 1% with 90% confidence? Round the intermediate calculations to three decimal places and round up your final answer to the next whole number. n