Question: How do I figure this out on a calculator? It is estimated that the proportion of Californians in favor of Proposition 5 is between 0.4

How do I figure this out on a calculator?

It is estimated that the proportion of Californians in favor of Proposition 5 is between 0.4 and 0.6.The sponsors of the proposition would like to sample Californians and get a 95 percent confidence interval for the true proportion of people in favor of Proposition 5. They want to restrict the error level to 5 percentage points. The required sample size is then:

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