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3 years ago

The difference between a number and 12 is 20

Mathematics

1 answer:

Alexxx [7]3 years ago

6 0

the equation would be x-12=20.

the solution would be x=8.

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How large a sample should be selected to provide a 95% confidence interval with a margin of error of 6? Assume that the populati

marshall27 [118]

Using the z-distribution, it is found that a sample of 171 should be selected.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

$\overline{x} \pm z\frac{\sigma}{\sqrt{n}}$

The margin of error is:

$M = z\frac{\sigma}{\sqrt{n}}$

In which:

$\overline{x}$ is the sample mean.

z is the critical value.

n is the sample size.

$\sigma$ is the standard deviation for the population.

For this problem, the parameters are:

$z = 1.96, \sigma = 40, M = 6$

Hence we solve for n to find the needed sample size.

$M = z\frac{\sigma}{\sqrt{n}}$

$6 = 1.96\frac{40}{\sqrt{n}}$

$6\sqrt{n} = 40 \times 1.96$

$\sqrt{n} = \frac{40 \times 1.96}{6}$

$(\sqrt{n})^2 = \left(\frac{40 \times 1.96}{6}\right)^2$

n = 170.7.

Rounding up, a sample of 171 should be selected.

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

#SPJ1

4 0

2 years ago

128,134,140,146,152 whats the nwxt number

zaharov [31]

Just kept adding 6.

The next number = 152 + 6 = 158

7 0

4 years ago

Read 2 more answers

melisa1 [442]

Answer:

$\boxed{\sf 10}$

Step-by-step explanation:

The additive number of any number is the number when added to the number gives a result of zero.

So, if we add 10 to -10 we get a result of zero.

=> -10+10

=> Zero

5 0

3 years ago

22 gallons of gas cost $65.56 what is the unit rate for one gallon of gas

Kitty [74]

Hey there!

If we would want to find out what it would be, we would have to divide it.

Your correct answer would be (2.98)

I did 65.56/22.

Hope this helps you!

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3 years ago

Read 2 more answers

Eden and Courtney each have a bag of candy. There is a mixture of chocolate and sour candy. Eden has a total of 5 pieces of cand

Svetradugi [14.3K]

Step-by-step explanation:

8 0

3 years ago