Answer:
A. 9.7%
Step-by-step explanation:
margin of error:
z *
n is sample size
z is the z score (for a 95% confidence interval you would use 1.96)
p is the sample proportion
to solve for 'p', remember that if a decimal value is given, use that. but if it is a whole number, then divide that number by the sample size, and substitute it into the formula.
in this case we are given 43% so 0.43.
in the formula :
1.96 *
if you calculate this you get around 0.09703 this is 9.7%
7/10
9/10 - ____ = 2/10
9 - 7 = 2
So, 9/10 - 7/10 = 2/10 or 1/5
(- 3/4) + (-3/8)
= (- 6/8) - 3/8
= negative 9/8
I believe it's 6/10 total. All I did was add the numerator and denominator.