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3. A Wall Street Journal/NBC News survey was used to collect data on how Americans feel about the quality of newspaper and television news coverage (The Wall Street Journal, June 27, 1997). One question asked whether the respondent believes that news coverage of the US economy is balanced, too negative, or too positive. Preliminary estimates are that approximately 50% of the population will feel that the news coverage is balanced.,a. What sample size is recommended if the desired margin of error is 3.3%? Use 95% confidence.,b. What sample size is recommended if the desired margin of error is 2.5%? Use 95% confidence,

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