5.3.17. M oney magazine reported that 30% of 1013 adults telephoned at nindom could not correctly define any of the four main types of life insurance. Built into th.at figure, the article cautioned, is a "3.1% margin of error." Verify th.at computation and explain in a short paragraph what the 3.1% implies.
5.3.18. Vira1 infections contracted early during a woman's pregnancy can be very harmful to the fetus. One study found a total of 86 deaths and birth defects among 202 pregnancies complicated by a first-trimester German measles infection (47). Is it believable that the true proportion of abnormal births u nder similar circumstances could be as high as 50%? Answer the question by calculating the margin of error for the sample proportion, 86/2(]2.
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