Answer:
147 women
Step-by-step explanation:
From the statement we have, the error = 3.4 and the standard deviation sd = 25
Now, for 90% confidence, we have that a = 1 - 0.9 = 0.1
a / 2 = 0.05
if we look for the value of z for 0.05 (in the attached normal distribution table we look for), we have:
z_a / 2 = -1.645
Now we have to:
n = (z_a / 2 * sd / E) ^ 2
We replace and we are left with:
n = (-1,645 * 25 / 3.4) ^ 2
n = 146.3, that is to say 147 women.
