Does regular exercise reduce bone loss in postmenopausal women? Here are two ways to study this question. Which design willproduce more trustworthy data?1. A researcher finds 1000 postmenopausal women who exercise regularly. She matches each with a similar postmenopausalwoman who does not exercise regularly, and she follows both groups for five years.2. Another researcher finds 2000 postmenopausal women who are willing to participate in a study. She assigns 1000 of thewomen to a regular program of supervised exercise. The other 1000 continue their usual habits. The researcher followsboth groups for five years.Select all statements that are true.1 is an observational study and 2 is an experiment.The effect of a lurking variable, such as a condition that might affect someone's desire to exercise and their bone loss, islikely to be larger in 2 and less in 1 due to randomization.The effect of a lurking variable, such as a condition that might affect someone's desire to exercise and their bone loss, islikely to be larger in 1 and less in 2 due to randomization.A placebo would be impractical in both 1 and 2.1 and 2 are both experiments.1 and 2 are both observational studies.

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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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