In medical investigations, the ratio u 5 p1yp2 is often ofmore interest than the difference p1 2 p2 (e.g., individualsgiven treatment 1 are how many times as likely torecover as those given treatment 2?). Let u 5 p 1yp 2.When m and n are both large, the statistic ln(u) hasapproximately a normal distribution with approximatemean value ln(u) and approximate standard deviation[(m 2 x)y(mx) 1 (n 2 y)y(ny)]1y2.a. Use these facts to obtain a large-sample 95% CI formulafor estimating ln(u), and then a CI for u itself.b. Return to the heart-attack data of Example 1.3, andcalculate an interval of plausible values for u at the95% confidence level. What does this interval suggestabout the efficacy of the aspirin treatment?

1 STAT 145 Introduction to Statistics 1 Chapter 1 Data Collection Terms ormulas 1.1 Introduction to the Practice to Statistics Objectives: Definitions and process of statistics / Qualitative vs. Quantitative Statistical...