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07 Practice: Estimation Procedures Suppose you are interested in the proportion of child safety seats located in a particular warehouse that are defective. You randomly select a sample of child safety seats from the population of child safety seats in that warehouse. The sample provides a sample proportion of 0.22. You construct a 95% confidence interval for the proportion of child safety seats that are defective. If the number of child safety seats in the sample is 100, then the confidence interval is (0.122, 0.318) If the number of child safety seats in the sample is 500, then the confidence interval is As the sample size increases, the confidence interval becomes narrower Suppose you would like to have a confidence interval that is about 0.02 wide. What sample size do you need to achieve that 0.02? (Note: Select the sample size that most closely matches the desired interval width.) ? 1,000 ? 5,000 ? 10,000 ? 500

          07 Practice: Estimation Procedures
Suppose you are interested in the proportion of child safety seats located in a particular warehouse that are defective. You randomly select a sample
of child safety seats from the population of child safety seats in that warehouse. The sample provides a sample proportion of 0.22. You construct a
95% confidence interval for the proportion of child safety seats that are defective.
If the number of child safety seats in the sample is 100, then the confidence interval is (0.122, 0.318)
If the number of child safety seats in the sample is 500, then the confidence interval is
As the sample size increases, the confidence interval becomes narrower
Suppose you would like to have a confidence interval that is about 0.02 wide. What sample size do you need to achieve that 0.02? (Note: Select the
sample size that most closely matches the desired interval width.)
? 1,000
? 5,000
? 10,000
? 500

07 Practice: Estimation Procedures
Suppose you are interested in the proportion of child safety seats located in a particular warehouse that are defective. You randomly select a sample
of child safety seats from the population of child safety seats in that warehouse. The sample provides a sample proportion of 0.22. You construct a
95% confidence interval for the proportion of child safety seats that are defective.
If the number of child safety seats in the sample is 100, then the confidence interval is (0.122, 0.318)
If the number of child safety seats in the sample is 500, then the confidence interval is
As the sample size increases, the confidence interval becomes narrower
Suppose you would like to have a confidence interval that is about 0.02 wide. What sample size do you need to achieve that 0.02? (Note: Select the
sample size that most closely matches the desired interval width.)
? 1,000
? 5,000
? 10,000
? 500

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