Answer:
A sample size of 61 will produce a margin of error of 9% with 90% confidence level
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 of the confidence interval is:
For this problem, we have that:
90% confidence level
So , z is the value of Z that has a pvalue of , so .
What sample size will produce a margin of error of 9% with 90% confidence level
This is n when M = 0.09. So
A sample size of 61 will produce a margin of error of 9% with 90% confidence level
It would be D (2, 3.5). Partitions in the ratio 1:1 means it cuts it in half basically.
Answer:
D
Step-by-step explanation:
Focus on the x-axis only, not the y-axis.
0.4 + 0.4 = 0.8
0.8 + 0.4 + 1.2
etc.
Hope this helps!
Answer:
720 mi²
Step-by-step explanation:
The map has a scale of 1 in: 30 mi, meaning that for every inch you see on the map, in the real-life location, it will measure 30 miles. So we can find the area of the park on the map and then turn it into miles using the scale:
Area of a rectangle:
Replace the known values:
The area on the map is 24 mi², we can turn it to miles using the scale by multiplying our result with 30:
And last but not least, don't forget to put the unit!