HLTH 501 final bio
Question 3 10 out of 10 points A study is performed to assess whether there is an association between exposure to second hand cigarette 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 study is an example of a: Selected Answer: Case control study Question 4 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 those without? Apply the appropriate test at alpha=0.05. 1. Critical t value: (2 points) 2. Computed t: (2 points) 3. Based on comparing the critical t value to the computed t value which of the followingis (are) true? (6 points) a. There is statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without. b. There is not statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without. c. There are not enough data points to reach a conclusion. d. b and c.
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- August 9, 2021
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