What's the equation for q and r

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

The slope of (0,0),(6,7)

Thepotemich [5.8K]

The equation is y2-y1/ x2-x1= slope, so 7-0/ 6-0= 6/7 or about 0.857.

6 0

3 years ago

35 students like physics in a class of 50 students, 30 like maths and 3 do not like anyone of them. how many students like physi

Serga [27]

Answer:

35 still nothing changed the variable

Step-by-step explanation:

8 0

3 years ago

Once you have created both sets of numbers, complete the following tasks. In each task, make sure to clearly label which set you

mezya [45]

Answer:

Step-by-step explanation:

We need a picture for me I need a picture

8 0

3 years ago

5: Answer the questions completely: Jordan has a new puppy. She wants to put a fence around part of her yard to cover an area of

yuradex [85]

There are many possible solutions to this problem.

Area (A) = Length (L) x width (w)

200 = L x w (any two numbers whose product is 200 is acceptable)

I am going to choose L=20 and w=10, then A = 20 x 10 = 200

Perimeter (P) = 2L + 2w

= 2(20) + 2(10)

= 40 + 20

= 60

Answer: one possible solution is L=20, w=10, P=60

8 0

3 years ago