Question: Last year Lipton Tea Company conducted a mall intercept study at
Last year, Lipton Tea Company conducted a mall-intercept study at six regional malls around the country and found that 20% of the public preferred tea over coffee as a mid-afternoon 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 in order to achieve an accuracy level of ± 2.5% at the 99% level of confidence? What about at the 95% level of confidence?
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