Question: b. When calculating required sample sizes for estimating a population proportion with a given precision, 0.5 is often taken as the 'planning value' for the

b. When calculating required sample sizes for estimating a population proportion with a given precision, 0.5 is often taken as the 'planning value' for the population proportion . Why is it necessary to assume a 'planning value' for it ? Why the specific value 0.5 is used? [ 4 marks]

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