Suppose we want to study the effect of smoking on lung capacity in women. Match the study to experimental or observational.                                       Find 100 women age 20 who do not currently smoke. Randomly assign 50 of the 100 women to the smoking treatment and the other 50 to the no smoking treatment. Those in the smoking group smoke a pack a day for 10 years while those in the control group remain smoke free for 10 years.  Measure lung capacity for each of the 100 women.                                       Find 100 women age 30 of which 50 have been smoking a pack a day for 10 years while the other 50 have been smoke free for 10 years.  Measure lung capacity for each of the 100 women.  Analyze, interpret, and draw conclusions from data.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.3: Least Squares Approximation
Problem 31EQ
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Suppose we want to study the effect of smoking on lung capacity in women. Match the study to experimental or observational.

                                     

Find 100 women age 20 who do not currently smoke. Randomly assign 50 of the 100 women to the smoking treatment and the other 50 to the no smoking treatment. Those in the smoking group smoke a pack a day for 10 years while those in the control group remain smoke free for 10 years.  Measure lung capacity for each of the 100 women.

                                     

Find 100 women age 30 of which 50 have been smoking a pack a day for 10 years while the other 50 have been smoke free for 10 years.  Measure lung capacity for each of the 100 women.  Analyze, interpret, and draw conclusions from data.

 
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