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There is no prior information about the proportion of Americans who support the gun control in 2018. If we want to estimate 97% confidence interval

There is no prior information about the proportion of Americans who support the gun control in 2018. If we want to estimate 97% confidence interval for the true proportion of Americans who support the gun control in 2018 with a0.3 margin of error, how many randomly selected Americans must be surveyed?

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