Use the confidence interval you constructed in (a) to comment on whether the true mean total body iron level in present-day US pregnant women is different than reported in the 1996-2006 NHANES study.
Explain your reasoning clearly.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.