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Mathematics

2 answers:

aleksandr82 [10.1K]2 years ago

4 0

Answer:

Step-by-step explanation:

First, let's figure out what our two numbers are.

-7/2 = -3 1/2.

So if we have -2 + -3 1/2, that means we must first travel -2 units, which will be the first blue arrow, then add -3 1/2 more units. This would give us an answer of -5 1/2 units.

That means B is the answer, because it's the only one that ends up at -5 1/2.

densk [106]2 years ago

3 0

Answer:

I believe its C

Step-by-step explanation:

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tatuchka [14]

Answer:

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Step-by-step explanation:

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3 0

2 years ago

4)In order to set rates, an insurance company is trying to estimate the number of sick daysthat full time workers at an auto rep

bagirrra123 [75]

Answer:

A sample of 18 is required.

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:

$\alpha = \frac{1 - 0.92}{2} = 0.04$

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 $1 - 0.04 = 0.96$ , so Z = 1.88.

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.

A previous study indicated that the standard deviation was 2.2 days.

This means that $\sigma = 2.2$

How large a sample must be selected if the company wants to be 92% confident that the true mean differs from the sample mean by no more than 1 day?

This is n for which M = 1. So

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

$1 = 1.88\frac{2.2}{\sqrt{n}}$