Question: Looking for help on this one, thanks! Suppose John has been commissioned to estimate the infant mortality rate in Thailand. From a random sample of

Looking for help on this one, thanks!

Suppose John has been commissioned to estimate the infant mortality rate in Thailand. From a random sample of 500 live births, he finds that 0.8% of them resulted in infant deaths. He then constructs a 90% confidence interval for the infant mortality rate in Thailand:

0.008 1.645 * SQRT [(0.008*0.992)/500]

or 0.001446 to 0.014554. Then John concludes, "We can be 90% confident that the proportion of infant deaths in Thailand is somewhere between 0.001446 and 0.014554." How did he do?

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