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8-4 Estimation Sample Size

8-4 Estimation Sample Size. Looking at the error as the limiting factor. If E is determined to be a certain amount, then by solving the equation. Looking at the error as the limiting factor. If E is determined to be a certain amount, then by solving the equation for E, it can be seen that.

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8-4 Estimation Sample Size

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  1. 8-4 EstimationSample Size

  2. Looking at the error as the limiting factor.. If E is determined to be a certain amount, then by solving the equation

  3. Looking at the error as the limiting factor.. If E is determined to be a certain amount, then by solving the equation for E, it can be seen that This is for numerical data that has a mean and standard deviation

  4. Looking at error as the limiting factor Of a binomial distribution…using the same idea…

  5. Looking at error as the limiting factor Of a binomial distribution…using the same idea… and isolating n creates but…this implies we know p.

  6. And if we don’t… Watch some algebra… Completing the square And since p is between 0 and 1, the maximum overall value of the expression will be….

  7. Therefore When we have no estimate for p use Note: Some books say to take p and q as .5

  8. Practice Suppose a candidate is planning a poll and wants to estimate voter support within 3% with 95% confidence. How large a sample is needed?

  9. Round up to be safe Some books make the suggestion to use the Error equation and use .5 for phat and qhat for a “worst case scenario”. Notice that this works out the same way:

  10. Round up to be safe Some books make the suggestion to use the Error equation and use .5 for phat and qhat for a “worst case scenario”. Notice that this works out the same way: Notice also that you don’t need a numerical formula to solve it. If you know the error formula, you have enough.

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