After a polution event in an estuary, we want to estimate proportion of shell fish that are impacted by the pollution in the water. What sample size do we need to ensure our 95% confidence interval is no more than +/-0.025 given no information on the likely level of the proportion?

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A: given data n=30df=n-1=30-1=29x¯=2.8S2=0.43s=0.43=0.6557CI=0.95α=1-0.95=0.05