1 / 6

Chapter 10: Confidence Intervals

Chapter 10: Confidence Intervals. Section 2: Estimating a Population Proportion. Margin of Error. To calculate our margin of error in this case, we will use:. CI for Population Proportion (when p is known ).

tea
Télécharger la présentation

Chapter 10: Confidence Intervals

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 10: Confidence Intervals Section 2: Estimating a Population Proportion

  2. Margin of Error • To calculate our margin of error in this case, we will use:

  3. CI for Population Proportion(when pis known) • Choose a SRS of size n from a population having unknown proportion p of successes. An approximate level C confidence interval for pis:

  4. PRACTICE IT! • A May 2000 Gallup Poll found that 38% of a random sample of 1012 adults said that they believe in ghosts. Find a 95% confidence interval for the true proportion of adults who believe in ghost. • We are 95% confident that the true proportion of adults who believe in ghosts is between 35% and 41%.

  5. Determining Sample Size • If we wanted to determine an appropriate sample size for a desired margin of error we would use:

  6. PRACTICE IT! • Another Gallop Poll is taken in order to measure the proportion of adults who approve of attempts to clone humans. What sample size is necessary to be within + 0.04 of the true proportion of adults who approve of attempts to clone humans with a 95% Confidence Interval?

More Related