These are the choices I found on the internet:
<span>A) trust.
B) cartel.
C) natural monopoly.
D) devised oligopoly.
The best answer would be letter C - natural monopoly. </span>This is a situation where one firm can supply a market's entire demand (because of a unique raw material, technology, or other factors) for a good or service at a value lower than two or more firms.
Provide info about the question
Using the t-distribution, it is found that:
a. The <u>margin of error</u> is of 4.7 homes.
b. The 98% confidence interval for the population mean is (19.3, 28.7).
The information given in the text is:
- Sample mean of
. - Sample standard deviation of
. - Sample size of
.
We are given the <u>standard deviation for the sample</u>, which is why the t-distribution is used to solve this question.
The confidence interval is:
![\overline{x} \pm M](https://tex.z-dn.net/?f=%5Coverline%7Bx%7D%20%5Cpm%20M)
The margin of error is:
![M = t\frac{s}{\sqrt{n}}](https://tex.z-dn.net/?f=M%20%3D%20t%5Cfrac%7Bs%7D%7B%5Csqrt%7Bn%7D%7D)
Item a:
The critical value, using a t-distribution calculator, for a two-tailed <u>98% confidence interval</u>, with 23 - 1 = <u>22 df</u>, is t = 2.508.
Then, the <em>margin of error</em> is:
![M = t\frac{s}{\sqrt{n}} = 2.508\frac{9}{\sqrt{23}} = 4.7](https://tex.z-dn.net/?f=M%20%3D%20t%5Cfrac%7Bs%7D%7B%5Csqrt%7Bn%7D%7D%20%3D%202.508%5Cfrac%7B9%7D%7B%5Csqrt%7B23%7D%7D%20%3D%204.7)
Item b:
The interval is:
![\overline{x} - M = 24 - 4.7 = 19.3](https://tex.z-dn.net/?f=%5Coverline%7Bx%7D%20-%20M%20%3D%2024%20-%204.7%20%3D%2019.3)
![\overline{x} + M = 24 + 4.7 = 28.7](https://tex.z-dn.net/?f=%5Coverline%7Bx%7D%20%2B%20M%20%3D%2024%20%2B%204.7%20%3D%2028.7)
The 98% confidence interval for the population mean is (19.3, 28.7).
A similar problem is given at brainly.com/question/15180581
Answer:
The first one is 12
second one is 1
third one is 23
last one 5
Step-by-step explanation: