Purchase Solution

90 percent confidence intervals of surgical procedures

Not what you're looking for?

Ask Custom Question

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.

Purchase this Solution
Solution Summary

Percent confidence intervals are determined and hypotheses are tested.

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 ...

Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

View More Free Quizzes
Related BrainMass Solutions

  • Confidence Intervals

    The 90 percent confidence intervals are used.

  • Inference for Distributions

    If this is so, we can use t- procedures-do your histograms indicate that we can use t-procedures? d). Give a 90% 2-Sample T interval confidence for the mean difference between the mean IQ scores for all boys and girls in the district.

  • Confidence Intervals, Variation, and Normality Assumption

    (b) What sample size would be necessary to estimate the true weight with an error of ± 0.03 grams with 90 percent confidence? (c) Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacturing. 2.

  • Confidence Intervals with Tootsie Rolls

    (b) What sample size would be necessary to estimate the true weight with an error of ± 0.03 grams with 90 percent confidence? (c) Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.

  • General Statistics Questions

    (a) Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. (b) Check the normality assumption. (c) Try the Very Quick Rule. Does it work well here? Why, or why not?

  • confidence interval of 10 miniature Tootsie Rolls's weight

    (b) What sample size would be necessary to estimate the true weight with an error of ± 0.03 grams with 90 percent confidence?

  • Estimation and Confidence Intervals for American Sugar Producers Association

    For a 90 percent confidence interval, what is the value of t? 4. Develop the 90 percent confidence interval for the population mean. 5. Would it be reasonable to conclude that the population mean is 63 pounds? Please see the attached file.

  • Confidence intervals for pharmacy customers

    265026 Confidence intervals for pharmacy customers A random sample of 16 pharmacy customers showed the waiting times below in minutes.

  • Statistics - Confidence Interval

    (a) Construct a 90 percent confidence interval for the true proportion. (b) Is the sample size large enough to be convincing? Explain. The solution file is attached. The expert examines the confidence intervals for certain brands of dry noodles.

View More Related Solutions