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Independent Samples: Comparing Proportions

Independent Samples: Comparing Proportions. Lecture 42 Section 11.5 Fri, Apr 8, 2005. Confidence Intervals. A confidence interval for p 1 – p 2 is of the form. or. Confidence Intervals.

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Independent Samples: Comparing Proportions

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  1. Independent Samples: Comparing Proportions Lecture 42 Section 11.5 Fri, Apr 8, 2005

  2. Confidence Intervals • A confidence interval for p1 – p2 is of the form or

  3. Confidence Intervals • Since we are trying to estimate the difference between p1 and p2, it would not make sense to use the pooled estimate of.

  4. Example • Re-do Example 11.8, p. 669, as a confidence interval problem.

  5. Confidence Intervals on the TI-83 • Press STAT. • Select 2-PropZInt. • A window appears. • Enter x1. • Enter n1. • Enter x2. • Enter n2.

  6. Confidence Intervals on the TI-83 • Enter the confidence level. • Select Calculate. • Press ENTER.

  7. Confidence Intervals on the TI-83 • A window appears with the following information. • The confidence interval for p1 – p2. • The value of p1^. • The value of p2^. • n1. • n2.

  8. Example • Re-do Example 11.8, p. 669, using the TI-83.

  9. Let’s Do It! • Let’s do it! 11.7, p. 671 – HMOs on the Rise.

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