1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alex
3 years ago
11

There are 9,481 eligible voters in a precinct. 500 were selected at random and asked to indicate whether they planned to vote fo

r the Democratic incumbent or the Republican challenger. Of the 500 surveyed, 350 said they were going to vote for the Democratic incumbent. Using an 80% confidence level, what are the confidence limits for the proportion that plan to vote for the Democratic incumbent
Mathematics
1 answer:
maria [59]3 years ago
8 0

Answer:

The confidence limits for the proportion that plan to vote for the Democratic incumbent are 0.725 and 0.775.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

Of the 500 surveyed, 350 said they were going to vote for the Democratic incumbent.

This means that n = 500, \pi = \frac{350}{500} = 0.75

80% confidence level

So \alpha = 0.2, z is the value of Z that has a pvalue of 1 - \frac{0.2}{2} = 0.9, so Z = 1.28.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.75 - 1.28\sqrt{\frac{0.75*0.25}{500}} = 0.725

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.75 + 1.28\sqrt{\frac{0.75*0.25}{500}} = 0.775

The confidence limits for the proportion that plan to vote for the Democratic incumbent are 0.725 and 0.775.

You might be interested in
Suzie simplified the following expression. What mistake did she make? 2(3 + 9x) - 2x 6 + 9x - 2x 6 + 7x
Levart [38]

2(3 + 9x) - 2x

= 6 + 9x - 2x <----------------mistake right here

= 6 + 7x

Correct:

Expanding by using distributive property

2(3 + 9x) - 2x

= 2* 3 + 2 * 9x - 2x

= 6 + 18x - 2x

= 6 + 16x


3 0
3 years ago
An angle measures 125 degrees. Through what fraction of a circle does the angle turn?
Bingel [31]
I think 50 out of 30 degrees
5 0
3 years ago
Read 2 more answers
Please help it’s due now
Elan Coil [88]

Answer:

increase

Step-by-step explanation:

increase because it's going up

8 0
3 years ago
kennedy has 12 apples. together, she and Ariana have 42 apples. which diagram best represents the situation where A is the amoun
Katarina [22]
There is no diagram to chose from
3 0
3 years ago
Each cube in this rectangular prism is 1 cm3.What is the volume of the rectangular prism?
Lelechka [254]

Answer:

Volume of rectangular prism = 20\ cm^3

Step-by-step explanation:

Given rectangular prism is made up of small cubes of volume 1 cubic centimeter.

To find volume of rectangular prism.

Solution:

Volume of rectangular prism is = length\times width \times height

We know that all sides of a cube are equal in measure.

So, we will count the number of cubes on each side to get the exact measure.

Length side = 4 cubes = 5 cm

Width side = 2 cubes = 2 cm

Height side = 2 cubes = 2 cm

Thus volume of rectangular prism =  5\ cm\times 2\ cm \times 2\ cm

Volume of rectangular prism = 20\ cm^3

4 0
3 years ago
Other questions:
  • Pleaseeeeeeeeee help me
    14·1 answer
  • Kathy bought some fruit to eat with her breakfast this week. She bought 2 peaches, 3 plums, 1 banana, and 1 apple. Without looki
    8·1 answer
  • Suppose that factory a produces 12 tables and 6 chairs an hour while factory b produces 8 tables and 4 chairs and hour. how many
    5·1 answer
  • Solving polynomial equations<br><img src="https://tex.z-dn.net/?f=6%20%7Bx%7D%5E%7B2%7D%20%3D%2048x" id="TexFormula1" title="6 {
    9·1 answer
  • Please correct my work and show your work if I MESSED up please
    12·1 answer
  • How o find the lcm. if its 453 and 609
    14·1 answer
  • Y+5=-4(x-3) in standard form
    6·1 answer
  • Brian bought 150 cases of sparklers for the party each case cost $12 how much money did Brian spend on sparklers?
    12·1 answer
  • What is the length of BC? <br> 9 units<br> 11 units<br> 15 units<br> 16 units
    7·1 answer
  • I'll give brainliest ​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!