Con?dence interval for population proportion

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1. According to The Economist, 55% of all French people of voting age are opposed to the proposed European constitution.13 Assume that this percentage is based on a random sample of 800 French people. Give a 95% con?dence interval for the population proportion in France that was against the European constitution.

2. According to BusinessWeek, many Japanese consider their cell phones toys rather than tools.14 If a random sample of 200 Japanese cell phone owners reveals that 80 of them consider their device a toy, calculate a 90% con?dence interval for the population proportion of Japanese cell phone users who feel this way.

Reference no: EM13968635

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