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But even if the researcher randomized and found that the various fertilizers seemed to produce different yields, how could she know that those differences were not just the product of random variation

Younger adult consumers and health-conscious shoppers are more likely to adopt alternatives, while many existing tobacco users treat these products as complements rather than full substitutes

Compared to the non-smokers with asthma, the smokers with asthma had significantly impaired lung function, as shown by (i) lower forced expiration volume of 1s% (FEV 1 %), a ratio of FEV 1 /FVC, and asthma control test (ACT) scores, and (ii) higher asthma control questionnaire (ACQ) scores

Stroke: A stroke occurs when a blood vessel in the brain bursts or a blood clot forms