A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 22 subjects had a mean wake time of 94.2 min and a standard deviation of 44.3 min. Assume that the 22 sample values appear to be from a normally distributed population and construct a 98% confidence interval estimate of the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective? Find the confidence interval estimate. min
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 22 subjects had a mean wake time of 94.2 min and a standard deviation of 44.3 min. Assume that the 22 sample values appear to be from a normally distributed population and construct a 98% confidence interval estimate of the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective? Find the confidence interval estimate. min
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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![**Clinical Trial Confidence Interval Calculation**
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 22 subjects had a mean wake time of 94.2 minutes and a standard deviation of 44.3 minutes. Assuming that the 22 sample values appear to be from a normally distributed population, construct a 98% confidence interval estimate of the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective?
**Find the confidence interval estimate:**
- Enter the interval: \[ \text{?} \min < \sigma < \text{________} \min \]
- *(Round to two decimal places as needed.)*
**Does the result indicate whether the treatment is effective?**
- A. Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 0 minutes.
- B. Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 94.2 minutes.
- C. Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 0 minutes.
- D. Yes, the confidence interval indicates that the treatment is effective because the interval contains 0 minutes.
- E. Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 94.2 minutes.
- F. Yes, the confidence interval indicates that the treatment is not effective because the interval contains 0 minutes.
- G. No, the confidence interval does not indicate whether the treatment is effective.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F23157fb6-2442-47a5-a201-c815d86cbc5c%2F1ce3bdf2-7100-4940-a3ec-da8935242bf6%2Fqnr8f8z_processed.png&w=3840&q=75)
Transcribed Image Text:**Clinical Trial Confidence Interval Calculation**
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 22 subjects had a mean wake time of 94.2 minutes and a standard deviation of 44.3 minutes. Assuming that the 22 sample values appear to be from a normally distributed population, construct a 98% confidence interval estimate of the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective?
**Find the confidence interval estimate:**
- Enter the interval: \[ \text{?} \min < \sigma < \text{________} \min \]
- *(Round to two decimal places as needed.)*
**Does the result indicate whether the treatment is effective?**
- A. Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 0 minutes.
- B. Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 94.2 minutes.
- C. Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 0 minutes.
- D. Yes, the confidence interval indicates that the treatment is effective because the interval contains 0 minutes.
- E. Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 94.2 minutes.
- F. Yes, the confidence interval indicates that the treatment is not effective because the interval contains 0 minutes.
- G. No, the confidence interval does not indicate whether the treatment is effective.
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