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Confidence Interval

In a sample of 56 students, 32 said they plan to go to college. Find the 92% confidence interval of the proportion of students who plan to go to college. Confidence Interval. Sample Size. Standard Error. It’s the estimated standard deviation of the statistic.

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Confidence Interval

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  1. In a sample of 56 students, 32 said they plan to go to college. Find the 92% confidence interval of the proportion of students who plan to go to college.

  2. Confidence Interval Sample Size

  3. Standard Error • It’s the estimated standard deviation of the statistic

  4. An article by the right to die organization gave a proportion of physician’s who agree with their cause. I want to test their claim. I want to be within 0.05 with 95% confidence, how many must I sample? (Assume p = 0.5)

  5. Why did I let p = 0.5? If proportion is not given, use p = 0.5 because it’s including the most error. (Let n = 100)

  6. A pollster wishes to estimate the proportion of U.S. voters who favor capital punishment. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 2%?

  7. Homework • Worksheet

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