-6 (9 - 4)

George from the Manchester office, has a road atlas which has a scale of 1cm:10km. How far has he to travel to the Sheffield off

Usimov [2.4K]

The answer is 45km because times 10 and 4.5 which gets 45

3 0

4 years ago

Simplify 5p2 over 5p3

castortr0y [4]

Answer:

1/p^1

Step-by-step explanation:

5p^2/5p^3

cancel the fives

p^2/p^3

2. subtract denominator exponent from numerator exponent

p^-1
(you can't have negative exponents so you have to move the negative exponent coefficient to the denominator to make it possitive)

3. 1/p^1

4 0

3 years ago

A poll found that 52% of U.S. adult Twitter users get at least some news on Twitter. The standard error for this estimate was 2.

Leya [2.2K]

Answer:

The 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter is (0.46, 0.58). This means that we are 99% sure that the true proportion of all U.S. adult Twitter users who get some news on Twitter is between these two values.

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 z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

A poll found that 52% of U.S. adult Twitter users get at least some news on Twitter. The standard error for this estimate was 2.4%

This means that:

$\pi = 0.52, \sqrt{\frac{\pi(1-\pi)}{n}} = 0.024$

99% confidence level

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

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.52 - 2.575(0.024) = 0.46$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.52 + 2.575(0.024) = 0.58$

The 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter is (0.46, 0.58). This means that we are 99% sure that the true proportion of all U.S. adult Twitter users who get some news on Twitter is between these two values.

8 0

3 years ago

What is greater -2 3/4 or -2.35

Ksju [112]

(It is -2.35\)//ttfgfggg

6 0

3 years ago

Read 2 more answers

Ort each equation according to whether it has one solution, infinitely many solutions, or no solution

NeX [460]

The first one is infinite many solutions
The second one is (x=0) one solution
The third one is (x=3) one solution
The fourth one is no solution
The last one is no solution

6 0

3 years ago

Read 2 more answers