Question: Iron Deficiency? Refer to Exercise 9.8 on page 404. The following iron intakes, in milligrams, were obtained during a 24-hour period for 45 randomly selected adult females under the age of 51.

At the \(1 \%\) significance level, do the data suggest that adult females under the age of 51 are, on average, getting less than the \(\mathrm{RDA}\) of \(18 \mathrm{mg}\) of iron? Assume that the population standard deviation is \(4.2 \mathrm{mg}\). (Note: \(\bar{x}=14.68 \mathrm{mg}\).)

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