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(a) Public health authorities want to estimate the proportion of Australians aged 18-65 who caught the flu during winter 2019. If the true proportion is

(a) Public health authorities want to estimate the proportion of Australians aged 18-65 who caught the flu during winter 2019. If the true proportion is thought to be about 20%, how large a sample will we need if we want to be 90% sure that our estimate will be within 0.01 of the true value?

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