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QUESTION
I'm having trouble figuring out which formula to use.
I'm having trouble figuring out which formula to use.
If we believe the percent to be 75%, how many police officers must we survey to estimate the proportion of officers who graduated from a police academy if we want to ensure we can be 90% we are within 2% of the true proportion?
Keep intermediate steps to four decimals when possible & enter your answer to two decimals.
