Many studies have shown that babies born to women who smoked while pregnant tended to weigh less
Question:
Many studies have shown that babies born to women who smoked while pregnant tended to weigh less at birth than babies born to mothers who did not smoke while pregnant.
a. Are these studies observational studies or experiments?
b. Will a cause-and-effect conclusion be possible?
c. Identify the observational units in these studies.
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Related Book For
Introduction To Statistical Investigations
ISBN: 9781118172148
1st Edition
Authors: Beth L.Chance, George W.Cobb, Allan J.Rossman Nathan Tintle, Todd Swanson Soma Roy
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