Ask question

Ask question

All categories

3 years ago

6

Please help me, I need answers in 2 days. Please give answers in one picture otherwise i cannot view it without paying. Would be

very appreciated. Will give branliest

1 answer:

solniwko [45]3 years ago

6 0

Answer:

Step-by-step explanation:

i hope this is good enough

You might be interested in

Please help!!!!this is my last part of my discussion and I am stuck on it I would really appreciate the help!!

frosja888 [35]

x + 5 = 0 - > x = -5

5 0

3 years ago

There is a decrease in power. It can be concluded that there has also been a change in: A)current or voltage.

Serhud [2]

There is a decrease in power. It can be concluded that there has also been a change in:

A) current or voltage.

5 0

3 years ago

The volume of the cone is 130 units^3. Solve for x.<br> Height: 13<br> Radius: x

Gwar [14]

V=(1/3)hpir^2
v=130
h=13
r=x

130=(1/3)(13)pix^2
times both sides by 3
390=13pix^2
divide both sides by 13
30=pix^2
divide both sides by pi
30/pi=x^2
sqrt both sides
x≈3.09
radius is abou 3 units

3 0

3 years ago

The dwarves of the Grey Mountains wish to conduct a survey of their pick-axes in order to construct a 99% confidence interval ab

Dmitry_Shevchenko [17]

Answer:

The minimum sample size needed is 125.

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 $1 - \frac{\alpha}{2}$ .

The margin of error is:

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

For this problem, we have that:

$\pi = 0.25$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

What minimum sample size would be necessary in order ensure a margin of error of 10 percentage points (or less) if they use the prior estimate that 25 percent of the pick-axes are in need of repair?

This minimum sample size is n.

n is found when $M = 0.1$

So

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

$0.1 = 2.575\sqrt{\frac{0.25*0.75}{n}}$

$0.1\sqrt{n} = 2.575{0.25*0.75}$

$\sqrt{n} = \frac{2.575{0.25*0.75}}{0.1}$

$(\sqrt{n})^{2} = (\frac{2.575{0.25*0.75}}{0.1})^{2}$

$n = 124.32$

Rounding up

The minimum sample size needed is 125.

5 0

4 years ago

Pls help me so I cant be done with school'

Alenkinab [10]

Answer:

2 2/5

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers