Regression AnalysisWheelan describes the "Whitehall studies" in detail. In the second paragraph on page 207, Wheelan describes the "two characteristics typically associated with strong research." Two of these characteristics are congruent with the three criteria used by epidemiologists whenusing observational studies to establish cause/effect relationships described by Allaga and Gunderson in section 3.4.2 ofInteractive Statistics. Which two of these criteria is Wheelan emphasizing and which is he not addressing? Later when describingCommon Regression Mistakes, Wheelan uses as an example "the Nurses' Health Study." What key finding from this study lead to a widespread preventive practice for menopausal women? How was this practice later debunked? What section 3.4.2 lesson might we take from the Nurses' Health Study?