Question a study is performed to assess whether there is an association between exposure to second hand smoke in infancy and delayed development. Fifty children with delayed development and fifty with normal development are selected for investigation. Parents are asked whether their children were exposed to second hand cigarette smoke in infancy or not. This […]
Question An investigator conducts a study to investigate whether there is a difference in mean PEF in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarized below. Based on the data, is there statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to […]
Question Which of the following is true?A. In logistic regression, the predictors are dichotomous, and the outcome is a continuous variable. B. When calculating a correlation coefficient between two variables, the scales on which the variables are measured affect the value of the correlation coefficient. C. It is more difficult to reject a null hypothesis […]
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