A study examines whether giving antibiotics in infancy increases the likelihood
ID: 2946146 • Letter: A
Question
A study examines whether giving antibiotics in infancy increases the likelihood that the child will be overweight later in life. Prescription records were examined to determine whether or not antibiotics were prescribed during the first year of a child's life, and each child was classified as overweight or not at age 12. The researchers compared the proportion overweight in each group. The study concludes that: Infants receiving antibiotics in the first year of life were more likely to be overweight later in childhood compared with those who were unexposed (324% versus 18.2% at age 12, P-value-0.002)," using a 0.05 Let group 1 be the children who have been given antibiotics and let group 2 be the children who have not been given antibiotics. 21) 21) What is the explanatory variable? A) Whether or not infants received antibiotics during the first year of life. B) Whether or not the child was classified as overweight at age 12. 22) Is the explanatory variable categorical or quantitative? B) Quantitative. A) Categorical 23) 23) What is the response variable? A) Whether or not the child was classified as overweight at age 12 B) Whether or not infants received antibiotics during the first year of life lB) Quantitative. 24 24) Is the response variable categorical or quantitative? A) Categorical 25 25) Is this an experiment or an observational study? B) Experiment A) Observational study 26) 26) Define the appropriate parameters) and state the hypotheses for testing D) Ho: pi= p2 A) Ho: PIP2 Ha: PI P2 Ha: PI P2 Ha:Pip2 ?2 27) Give the notation for the sample statistic. D)Pi-P2 96 28 28) What is the value of the sample statistic? B) 0.324 0.002 D) 0.142 A) 0 182 29)4 29) Use the p-value to make a decision about these hypotheses using a-005 A) Reject HO B) Do not reject HO. 2 30) Can we conclude that whether or not children receive antibiotics in infancy causes the difference in 30) proportion classified as overweight? A) No B) YesExplanation / Answer
21. Option A is correct.
22. Option A is correct.
23. Option A is correct.
24. Option A is correct.
25. Option A is correct.
26. Option B is correct.
27. Option C is correct.
28. Option D is correct.
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