1 / 11

Chapter 22, Part 2

Chapter 22, Part 2. STA 200 Summer I 2011. Example 3. A supplier of tree seedlings advertises that 90% of its seedlings will survive a year when given proper care. A nursery buys 400 seedlings to grow for later sale. After a year, 352 survive.

nike
Télécharger la présentation

Chapter 22, Part 2

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 22, Part 2 STA 200 Summer I 2011

  2. Example 3 • A supplier of tree seedlings advertises that 90% of its seedlings will survive a year when given proper care. • A nursery buys 400 seedlings to grow for later sale. After a year, 352 survive. • Is there significant evidence that less than 90% of the supplier’s seedlings will survive? Use significance level α = .10.

  3. Example 3 (cont.) • Hypotheses: • Sampling Distribution of (assuming H0 is true): • P-value: • Conclusion:

  4. Example 4 • In a Zogby poll, 83% of 1,547 business leaders surveyed believe that a degree earned via an online program is as credible as one earned through a traditional campus-based program. • Is there evidence that p is greater than .80? Use α = .05.

  5. Example 4 (cont.) • Hypotheses: • Sampling Distribution of (assuming H0 is true): • P-value: • Conclusion:

  6. Example 5 • A claim is made that half of all commercially available toothpastes carry an American Dental Association seal verifying effective decay prevention. • In a sample of 46 toothpastes, 20 had an ADA seal. • Is there sufficient evidence that the percentage of toothpastes with the seal is less than 50%? Use .

  7. Example 5 (cont.) • Hypotheses: • Sampling Distribution of (assuming H0 is true): • P-value: • Conclusion:

  8. Example 6 • On 336 of 600 randomly selected farms, the farm operator was also the owner. • Is there evidence that the percentage of farmers who own their own farms is different than 60%? Use significance level .

  9. Example 6 (cont.) • Hypotheses: • Sampling Distribution of (assuming H0 is true): • P-value: • Conclusion:

  10. Example 7 • The claim is made that 50% of all American adults don’t believe secondary school students should be required to learn a foreign language. • In a CBS poll of 1,216 American adults, 47% have this opinion. • Is there evidence that is percentage is different than 50%? Use significance level .

  11. Example 7 (cont.) • Hypotheses: • Sampling Distribution of (assuming H0 is true): • P-value: • Conclusion:

More Related