Can anyone help me with this question

The average number if students in three classrooms was 24 altogether how many students were in three classrooms? I need the work

timama [110]

8 students were in each classroom. 24/3 is 8.

5 0

3 years ago

TV advertising agencies face increasing challenges in reaching audience members because viewing TV programs via digital streamin

yarga [219]

Answer:

a)

The 99% confidence interval for the proportion of all adult Americans who watched streamed programming up to that point in time is (0.5336, 0.5864). This means that we are 99% sure that the true proportion of all adult Americans who watched streamed programming up to that point in time is between these two values.

b)

A sample size of 664 is required.

Step-by-step explanation:

Question a:

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 reported that 56% of 2348 American adults surveyed said they have watched digitally streamed TV programming on some type of device.

This means that $\pi = 0.56, n = 2348$

99% confidence level

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

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.56 - 2.575\sqrt{\frac{0.56*0.44}{2348}} = 0.5336$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.56 + 2.575\sqrt{\frac{0.56*0.44}{2348}} = 0.5864$

The 99% confidence interval for the proportion of all adult Americans who watched streamed programming up to that point in time is (0.5336, 0.5864). This means that we are 99% sure that the true proportion of all adult Americans who watched streamed programming up to that point in time is between these two values.

b. What sample size would be required for the width of a 99% CI to be at most .05 irrespective of the value P?

The margin of error is of:

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

This sample size is given by n, with $M = 0.05$ and $\pi = 0.5$ .

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

$0.05 = 2.575\sqrt{\frac{0.5*0.5}{n}}$

$0.05\sqrt{n} = 2.575*0.5$

Dividing both sides by 0.05.

$\sqrt{n} = 2.575*10$

$(\sqrt{n})^2 = (2.575*10)^2$

$n = 663.1$

Rounding up:

A sample size of 664 is required.

7 0

3 years ago

Which numbers are irrational? Select each correct answer. 101 − − − √ 101 2.25 − − − − √ 2.25 − 4 √ −4 5 √

stepan [7]

All Real Numbers that are NOT Rational Numbers; cannot be expressed as fractions, only non-repeating, non-terminating decimals −√2 , −√5 3 , √21, √81 3 , √101
*Even roots (such as square roots) that don’t simplify to whole numbers are irrational.

5 0

3 years ago

What are 2 real life slope problems?

Scilla [17]

Umm no you need to do your own work and do not be asking for answers
Nothing is handed to you ....you need to work HARD to get what you want.

4 0

3 years ago

M=2 , b=-5 what does y equal ?

Elis [28]

Y= mx +b
Y= 2x -5
You have to find what is x

3 0

3 years ago

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