Assuming that π = 0.50 is a quick and conservative approach to use in a sample size calculation for a proportion.

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Assuming a proportion of π = 0.50 (50%) is a conservative approach because it assumes the highest variability or uncertainty in the estimated proportion. It may result in a larger sample size, which increases the precision and reduces the margin of error of the estimate, while not increasing the cost or time proportionally. However, if prior information or evidence suggests a different value of π or a lower margin of error is acceptable, a different assumption or calculation may be more appropriate.

Assuming That π = 0