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4 years ago

What is 1,099 rounded to the nearest ten

Mathematics

1 answer:

Elena-2011 [213]4 years ago

5 0

1,099= 1,100

HOPE THIS HELPS!!!

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A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she

Nataly_w [17]

Answer:

The minimum sample size needed is $n = (\frac{1.96\sqrt{\sigma}}{4})^2$ . If n is a decimal number, it is rounded up to the next integer. $\sigma$ is the standard deviation of the population.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.9}{2} = 0.05$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.05 = 0.95$ , so Z = 1.645.

Now, find the margin of error M as such

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

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How large a sample must she select if she desires to be 90% confident that her estimate is within 4 ounces of the true mean?

A sample of n is needed, and n is found when M = 4. So

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

$4 = 1.96\frac{\sigma}{\sqrt{n}}$

$4\sqrt{n} = 1.96\sqrt{\sigma}$

$\sqrt{n} = \frac{1.96\sqrt{\sigma}}{4}$

$(\sqrt{n})^2 = (\frac{1.96\sqrt{\sigma}}{4})^2$

$n = (\frac{1.96\sqrt{\sigma}}{4})^2$

The minimum sample size needed is $n = (\frac{1.96\sqrt{\sigma}}{4})^2$ . If n is a decimal number, it is rounded up to the next integer. $\sigma$ is the standard deviation of the population.

4 0

3 years ago

William owns 57.2 acres of land. He plans to donate land so a nature reserve can be built, but still needs 35.2 acres for his fa

jek_recluse [69]

Answer: 11.88

Step-by-step explanation: Subtract 35.2 from 57.2. Take your answer from that and multiply it by 0.54.

3 0

3 years ago

Center (8,4), r = 3<br> Write the standard equation for the circle.

Contact [7]

Answer:

(x - 8)² + (y - 4)² = 9

Step-by-step explanation:

(x - 8)² + (y - 4)² = 3²

(x - 8)² + (y - 4)² = 9

6 0

2 years ago

8(b+1)=-3(2+b) simply

gogolik [260]

Step-by-step explanation:

8(b+1)=-3(2+b)

8b+8=-6-3b

8b +3b = -6-8

11b = -14

b = -14/11

8 0

3 years ago

A circle has a radius of 19 cm. Find the radian measure of the central angle that intercepts an arc of length 4 cm.

Alona [7]

Answer:

1134

Step-by-step explanation:

$\pi \: radius \: 2$

=1134.114948

6 0

3 years ago