What sample size should be used

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Reference no: EM131275901

Last year, Lipton Tea Company conducted a mallintercept study at six regional malls around the country and found that 20% of the public preferred tea over coffee as a midafternoon hot drink.

This year, Lipton wants to have a nationwide telephone survey performed with random digit dialing.

What sample size should be used in this year's study to achieve an accuracy level of ±2.5% at the 99% level of confidence? What about at the 95% level of confidence?

Reference no: EM131275901

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