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12. Abnormalities. In the 1980s it was generally
Chapter 20, Problem 12(choose chapter or problem)
12. Abnormalities. In the 1980s it was generally believedthat congenital abnormalities affected about 5% of the nationschildren. Some people believe that the increase inthe number of chemicals in the environment has led to anincrease in the incidence of abnormalities. A recent studyexamined 384 children and found that 46 of them showedsigns of an abnormality. Is this strong evidence that therisk has increased?a) Write appropriate hypotheses.b) Check the necessary assumptions.c) Perform the mechanics of the test. What is theP-value?d) Explain carefully what the P-value means in context.e) Whats your conclusion?f ) Do environmental chemicals cause congenitalabnormalities?
Questions & Answers
QUESTION:
12. Abnormalities. In the 1980s it was generally believedthat congenital abnormalities affected about 5% of the nationschildren. Some people believe that the increase inthe number of chemicals in the environment has led to anincrease in the incidence of abnormalities. A recent studyexamined 384 children and found that 46 of them showedsigns of an abnormality. Is this strong evidence that therisk has increased?a) Write appropriate hypotheses.b) Check the necessary assumptions.c) Perform the mechanics of the test. What is theP-value?d) Explain carefully what the P-value means in context.e) Whats your conclusion?f ) Do environmental chemicals cause congenitalabnormalities?
ANSWER:Step 1 of 5
(a)
In present times, the opinion is that the amount of children with such problems has increased. Hence, the alternative hypothesis is:
