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In the 1980s it was generally believed that congenital abnormalities affected about 5% of the nation's children. Some people believe that the increase in the number of chemicals in the environment has led to an increase in the incidence of abnormalities. A recent study examined 384 children and found that 46 of them showed signs of an abnormality. Is this strong evidence that the risk has increased?
a) Write appropriate hypotheses.
b) Check the necessary assumptions.
c) Perform the mechanics of the test. What is the P-value?
d) Explain carefully what the P-value means in this context.
e) What's your conclusion?
f) Do environmental chemicals cause congenital abnormalities?
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in a one-factor anova with n17 n26 n35 n45 and n57 the sample standard deviations were s1 12 s2 24 s3 16 s4 46 s5
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Given that the group is estimating σ as 0.03, and assuming that they are relying on a 98% confidence interval, how high or low would a weekly standard deviation have to be for them to conclude that unusual events are taking place at the plant?
the following data were collected in an experiment designed to investigate the impact of different positions of the
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