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# 90 percent confidence intervals of surgical procedures

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1. The success rate of a surgical procedure is 70 per 100 cases examined in a sample. Find a 90 percent confidence interval for the total number of successes per 1,000 cases.

2. Ten items of 100 are defective. Develop a 95 percent confidence interval for the population proportion of defectives.

3. Assuming a normal population, use the data: 15, 19, 12, 14, 23 and 13 to test H0: mean=18 versus HA: mean = (different) 18 at alpha=.05.

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#### Solution Preview

90 percent confidence interval
1. The success rate of a surgical procedure is 70 per 100 cases examined in a sample. Find a 90 percent confidence interval for the total number of successes per 1,000 cases.
2. Ten items of 100 are defective. Develop a 95 percent confidence interval for the population proportion of defectives.
3. Assuming a normal population, use the data: 15, 19, 12, 14, 23 and 13 to test H0: mean=18 versus HA: mean =/ (different) 18 at ...

#### Solution Summary

Percent confidence intervals are determined and hypotheses are tested.

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