Question

1. A survey of hospital records of 35 randomly selected patients suffering from a particular disease indicated that the average hospital stay was 8 days with a standard deviation of 4.6 days. Construct a 90% confidence interval. Round interval answers to 2 decimal places. One sample T summary confidence interval: ?: Mean of population 90% confidence interval results: Mean Sample Mean Std. Err. DF L. Limit U. Limit ? 8 0.77754191 34 6.6852355 9.3147645 2. A national opinion poll found that 48% of all American adults agree that parents should be given vouchers that are good for education at any public or private school of their choice. How large of a sample would be required to be within 5 percentage points with 99% confidence? 3. A U.S. Coast Guard survey of 1000 small boats in the Cape Cod area found 280 in violation of one or more safety regulations. Give a 95% confidence estimate for p, the proportion of all unsafe small boats. Round interval answers to 2 decimal places. One sample proportion summary confidence interval: p : Proportion of successes Method: Standard-Wald 95% confidence interval results: Proportion Count Total Sample Prop. Std. Err. L. Limit U. Limit p 280 1000 0.28 0.014198591 0.25217127 0.30782873

          1. A survey of hospital records of 35 randomly selected patients suffering from a particular disease indicated that the average hospital stay was 8 days with a standard deviation of 4.6 days. Construct a 90% confidence interval. Round interval answers to 2 decimal places.
One sample T summary confidence interval:
?: Mean of population
90% confidence interval results:
Mean Sample Mean Std. Err. DF L. Limit U. Limit
? 8 0.77754191 34 6.6852355 9.3147645
2. A national opinion poll found that 48% of all American adults agree that parents should be given vouchers that are good for education at any public or private school of their choice. How large of a sample would be required to be within 5 percentage points with 99% confidence?
3. A U.S. Coast Guard survey of 1000 small boats in the Cape Cod area found 280 in violation of one or more safety regulations. Give a 95% confidence estimate for p, the proportion of all unsafe small boats. Round interval answers to 2 decimal places.
One sample proportion summary confidence interval:
p : Proportion of successes
Method: Standard-Wald
95% confidence interval results:
Proportion Count Total Sample Prop. Std. Err. L. Limit U. Limit
p 280 1000 0.28 0.014198591 0.25217127 0.30782873

1. A survey of hospital records of 35 randomly selected patients suffering from a particular disease indicated that the average hospital stay was 8 days with a standard deviation of 4.6 days. Construct a 90% confidence interval. Round interval answers to 2 decimal places.
One sample T summary confidence interval:
?: Mean of population
90% confidence interval results:
Mean Sample Mean Std. Err. DF L. Limit U. Limit
? 8 0.77754191 34 6.6852355 9.3147645
2. A national opinion poll found that 48% of all American adults agree that parents should be given vouchers that are good for education at any public or private school of their choice. How large of a sample would be required to be within 5 percentage points with 99% confidence?
3. A U.S. Coast Guard survey of 1000 small boats in the Cape Cod area found 280 in violation of one or more safety regulations. Give a 95% confidence estimate for p, the proportion of all unsafe small boats. Round interval answers to 2 decimal places.
One sample proportion summary confidence interval:
p : Proportion of successes
Method: Standard-Wald
95% confidence interval results:
Proportion Count Total Sample Prop. Std. Err. L. Limit U. Limit
p 280 1000 0.28 0.014198591 0.25217127 0.30782873

Added by Kathleen R.

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