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Setler79 [48]
3 years ago
11

Please help me with this i will mark brainliestQUICK!!!!!!

Mathematics
1 answer:
Yanka [14]3 years ago
3 0

Answer:

w - 3.3 + -3.3 = 5.6 - 3.3

w = 2.3

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You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estim
prohojiy [21]

Using the z-distribution, it is found that a sample size of 3,385 is required.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

The margin of error is:

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

In which:

  • \pi is the sample proportion.
  • z is the critical value.
  • n is the sample size.

In this problem, we have a 98% confidence level, hence\alpha = 0.98, z is the value of Z that has a p-value of \frac{1+0.98}{2} = 0.99, so the critical value is z = 2.327.

We have no prior estimate, hence \pi = 0.5 is used, which is when the largest sample size is needed. To find the sample size, we solve the margin of error expression for n when M = 0.02, hence:

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

0.02 = 2.327\sqrt{\frac{0.5(0.5)}{n}}

0.02\sqrt{n} = 2.327 \times 0.5

\sqrt{n} = \left(\frac{2.327 \times 0.5}{0.02}\right)

(\sqrt{n})^2 = \left(\frac{2.327 \times 0.5}{0.02}\right)^2

n = 3,385.

A sample size of 3,385 is required.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

5 0
2 years ago
Which shows the following expression after the negative exponents have been eliminated? xy^-6/x^-4 y^2, x=/0 y=/0
makvit [3.9K]
The expression would be \frac{x^5}{y^8} after the negative exponents have been removed.

A negative exponent basically tells us to "flip" the side of the fraction it's on.  This means that y⁻⁶ on the numerator would go to the denominator, and that x⁻⁴ on the denominator would go to the numerator.  This gives us:

\frac{x\times x^4}{y^2\times y^6}=\frac{x^5}{y^8}
4 0
3 years ago
Read 2 more answers
PLEASE HELP!!
siniylev [52]
1.) Substitute into the inequality is it true:
      1 < 2(-4)+5
      1 < -3   False so the answer is b. No
2.) since y < the expression for the line, shade below
6 0
3 years ago
You have found a home that you are interested in purchasing. Instead of a conventional loan, you agree to pay the premium for th
hodyreva [135]

Answer:

a.

$6,250

Step-by-step explanation:

Finances 95% of the loan.

So you have to pay 100% - 95% = 5% of the loan.

The amount of the home is listed at $125,000.

You have to pay 5% of this. So

0.05*125000 = $6,250

The answer is given by option A.

5 0
3 years ago
The width of a rectangle is 3 feet longer than it's length. What's the dimensions of the rectangle such that the perimeter of th
Varvara68 [4.7K]
So hmm check the picture below

what's the width? well, w = l + 3

5 0
3 years ago
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