# New Drugs

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In a comparative study of two new drugs, A and B... see attached

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##### Solution Summary

In a comparative study of two new drugs, A and B, patients were treated with drug A, and patients were treated with drug B. (The two treatment groups were randomly and independently chosen.) It was found that patients were cured using drug A and patients were cured using drug B. Let be the proportion of the population of all patients who are cured using drug A, and let be the proportion of the population of all patients who are cured using drug B. Find a confidence interval for . Then complete the table below.

Carry your intermediate computations to at least three decimal places. Round your responses to at least three decimal places.

1. What is the lower limit of the 90% confidence interval? _______

2. What is the upper limit of the 90% confidence interval? _______

###### Education

- BSc , Wuhan Univ. China
- MA, Shandong Univ.

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- "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
- "excellent work"
- "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
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- "Thank you very much for your valuable time and assistance!"

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