You are testing the claim that the proportion of men who own cats is smaller than the proportion of women who own cats.
You sample 120 men, and 85% own cats.
You sample 160 women, and 15% own cats.
Find the test statistic, rounded to two decimal places.

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.