Answer:
18 since 12 x 2 = 24 so 9 x 2 = 18
Step-by-step explanation:
Answer:
The sample size needed if the margin of error of the confidence interval is to be about 0.04 is 18.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
95% confidence level
So , z is the value of Z that has a pvalue of , so .
Past studies suggest this proportion will be about 0.15
This means that
Find the sample size needed if the margin of error of the confidence interval is to be about 0.04
This is n when M = 0.04. So
Rounding up
The sample size needed if the margin of error of the confidence interval is to be about 0.04 is 18.
<h2>
Answer: d.) <u><em>
y=4x+16</em></u></h2>
Step-by-step explanation: <em>Let's solve for y.</em>
<em>−4x+y=16</em>
<em>Step 1: Add 4x to both sides.</em>
<em>−4x+y+4x=16+4x</em>
<em>y=4x+16</em>
Answer:
Step-by-step explanation:b
No real roots. Roots will have imaginary numbers. This means the quadratic is either always above the axis, or always below.
One real root. The graph touches the x
-axis in one place. →
Two real roots. The graph crosses the x
-axis twice.