The formula for the population proportion is:
n = p ± Zc
where p = confidence level = 0.2
n = proportion = 0.22
= standard error = 0.01
Finding for Zc:
.20+(.01)=.22
Zc = 2
Referring to Critical value table for standard normal curve, a Zc value of 2 is equivalent to 95% Confidence Level.
Answer: 95% Confidence Level
1. The sum of four and nine times three
<h3> (4 + 9)×3</h3>2. eighteen divided by the sum of two and seven
or: 18÷(2+7), or: 18/(2+7)
3. Ten divided by the product of four and five
or: 10÷(4×5), or: 10/(4×5)
4. The Difference of eleven and four times five
<h3> (11 - 4)×5 </h3>5. The sum of one and two divided by twenty
or: (1+2)÷20, or: (1+2)/20
6. The sum of two and four and six times eight
<h3> (2 + 4 + 6)×8 </h3>7. The sum of twelve and sixteen divided by the sum of three and four
or: (12+16)÷(3+4), or: (12+16)/(3+4)
8. The difference of twenty-two and six divided by the sum of five and three
or: (22 - 6)÷(5+3), or: (22 - 6)/(5+3)