231 students went on a field trip 9 buses were filled and 15 students traveled in cars how many students were in each bus

The yearbook committee polled 80 randomly selected students from a class of 320 ninth graders to see if they would be willing to

Anon25 [30]

Using the z-distribution, as we are working with a proportion, it is found that the margin of error for the 90% confidence interval is of 0.0524 = 5.24%.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

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

In which:

$\pi$ is the sample proportion.

z is the critical value.

n is the sample size.

The margin of error is given by:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

In this problem, the critical value is given as z = 1.645, and since 26 out of 80 students said they would be willing to pay extra:

$n = 80, \pi = \frac{26}{80} = 0.325$

Then, the margin of error is of:

$M = 1.645\sqrt{\frac{0.325(0.675)}{80}} = 0.0524$

More can be learned about the z-distribution at brainly.com/question/25890103

5 0

2 years ago

An ellipse has a vertex at (14, –1). The focus of the ellipse nearest that vertex is located at (8, –1). If the center of the el

zavuch27 [327]

Refer to the diagram shown below.

The right vertex is at (14, -1), and the center is at (-1, -1).
Therefore the semi-major axis is
a = 14 - (-1) = 15

The right focus is at (8, -1).
Therefore
c = 8 - (-1) = 9.

The distance of the directrix from the center is
d = c²/a = 9²/15 = 81/15 = 27/5.

Therefore the equation for the left directrix is
x = -1 - 27/5 = -32/5

Answer: x = -27/5

6 0

3 years ago

Read 2 more answers

State the domain and range of this relation and whether or not it is a function Thanks!

tatiyna

Answer:

i just know is not a function

5 0

2 years ago

Original price: $50; Markdown: 30% Find the retail price

erma4kov [3.2K]

Answer:

hey

Step-by-step explanation:

pls pls plssss can you give me brainiest Plsss

7 0

2 years ago

Read 2 more answers

Work out the circumference of the circle when the radius is 6mm and give the answer in terms of pie.

s344n2d4d5 [400]

_______________________________

Hey!!

Solution,

Radius(r)= 6 mm

Circumference of circle=?

Now,

Circumference of circle=2 pie r

 =2*pi*6

 =12 pie

So the answer is 12 pie.

Hope it helps...

Good luck on your assignment

______________________________

4 0

2 years ago