The table above shows two lists of numbers. Which of the following is a true statement comparing list A and list B ?
A. The means are the same, and the standard deviations are different.
B. The means are the same, and the standard deviations are the same.
c. The means are different, and the standard deviations are different.
D. The means are different, and the standard deviations are the same.

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.