PLease answer 1, 2, and 3 so I can be free till december

According the April 12, 2017 Pew Research survey, 58% of Americans approve of U. S. Missile strikes in Syria in response to repo

Dvinal [7]

The probability that more than 30 Americans of the 50 in the survey approve of the missile strikes is .3859

<h3>How to determine if the normal distribution can be applied?</h3>

The given parameters are:

Sample size, n = 50

Population proportion, p = 0.58

By central limit theorem (CLT), the normal approximation can be used with this distribution because the sample size is greater than 30

<h3>The mean of the sampling proportion? </h3>

This is the same as the population proportion.

So, the mean of the sampling proportion is 0.58

<h3>The standard deviation sampling proportion? </h3>

This is calculated using:

$\sigma = \sqrt{\frac{p(1 - p)}{n}}$

So, we have:

$\sigma = \sqrt{\frac{0.58 * (1 - 0.58)}{50}}$

σ = 0.0698

<h3>That no more than 25 Americans approve of the missile strikes? </h3>

Start by calculating the p-value

p = 25/50

p = 0.5

The z-score is:

$z = \frac{x - \mu}{\sigma}$

This gives

$z = \frac{0.5 - 0.58}{0.0698}$

This gives

z = -1.15

Using the z-table of probability, the requested probability is:

P(z ≤ -1.15) = 0.1251

<h3>The probability that more than 30 approved of the missile strikes? </h3>

Start by calculating the p-value

p = 30/50

p = 0.6

The z-score is:

$z = \frac{x - \mu}{\sigma}$

This gives

$z = \frac{0.6 - 0.58}{0.0698}$

This gives

z = 0.29

Using the z-table of probability, the requested probability is:

P(z > 0.29) = 0.3859

Read more about normal distribution at:

brainly.com/question/4079902

#SPJ1

8 0

2 years ago

Find the missing dimension of the cylinder. Round your answer to the<br> nearest tenth.

vekshin1

Answer:

10ft

Step-by-step explanation:

volume= 502ft³

or, πr²h = 502 ft³

or, h= 502/ (4²π)

or, h= 9.98~10ft

6 0

3 years ago

Solve using any method you prefer 2 5/7 + 3 6/7

matrenka [14]

Answer: 5 11/7

Step-by-step explanation:

2 5/7 + 3 6/7

= 5 5+6/7

5 11/7

5 0

3 years ago

Read 2 more answers

Simplify (6+5x) + (7 + 3)<br><br> A. 8x + 13<br> B. 9x + 12<br> C. 12x + 9<br> D. 13x + 8

kumpel [21]

Its not one of the choices. its 5x+16

3 0

4 years ago

A research firm conducted a survey to determine the mean amount Americans spend on coffee during a week. They found the distribu

joja [24]

Answer: point estimate of mean = 20 dollars

interval estimate of mean = (18.775, 21.225)

Step-by-step explanation: A) point estimate

the main concept about point estimate is the fact that a single value derived from the sample is used directly to make inference about the population.

This simply means that for point estimation, sample estimator = population estimator

In this question of ours, our sample mean x-bar = 20 dollars, that implies that the population mean is also 20 dollars.

The implication of our answer is that an average american spends 20 dollars on dollars on coffee.

B) interval estimate.

the 95 percent confidence interval for population mean is given by the formulae below

μ = x + Zα/2 * σ/√n or μ = x - Zα/2 * σ/√n

where, μ = population mean, x = sample mean = 20, n= sample size= 64, σ= population standard deviation. Zα/2= z score at 5 percent level of significance for a two tailed test = 1.96 (note that level of significance = 1 - confidence level).

μ = 20+ 1.96 (5/√64)

μ = 20 + 1.96 * (5/8)

μ = 20 + 1.96 (0.625)

μ = 20 + 1.225

μ = 21.225

μ = 20- 1.96 (5/√64)

μ = 20 - 1.96 * (5/8)

μ = 20 - 1.96 (0.625)

μ = 20 - 1.225

μ = 18.775

Thus at 95 percent level of significance, population interval is (18.775, 21.225).

The implication of this is that on the average , an American spends at least 18.775 dollars on coffee and at most 21.225 dollars.

3 0

3 years ago