Given the coordinates below, what is AB?

A bank wonders whether omitting the annual credit card fee for customers who charge at least $3,000 in a year would increase the

Law Incorporation [45]

Answer:

The 95% confidence interval for the mean amount of the increase is ($541.6, $588.4). This means that we are 95% sure that the mean amount of increase of all customers who charge at least $3,000 in a year is between these two values.

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:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

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 $1 - 0.025 = 0.975$ , so Z = 1.96.

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.

$M = 1.96\frac{267}{\sqrt{500}} = 23.4$

The lower end of the interval is the sample mean subtracted by M. So it is 565 - 23.4 = $541.6

The upper end of the interval is the sample mean added to M. So it is 565 + 23.4 = $588.4

The 95% confidence interval for the mean amount of the increase is ($541.6, $588.4). This means that we are 95% sure that the mean amount of increase of all customers who charge at least $3,000 in a year is between these two values.

4 0

3 years ago

Help ASAP will give brainly 9th grade math

KatRina [158]

<h2>Answer: </h2><h2>14. 2z + 3yz - 6z +2yz + y - z - 4y 2z - 6z -4z - z -5z + 3yz + 2yz + y - 4y 3yz + 2yz -5z + 5yz + y - 4y </h2><h2>Answer = -5z + 5yz - 3y </h2><h2 /><h2>15. -4ab + 3ax + ba - 6xa -4ab + ba Answer = -5ab - 3xa </h2><h2 /><h2>16. -c(3b - 7a) -3bc - 7ac Step-by-step explanation: </h2><h2>Hopes this helps. Mark as brainlest plz!</h2>

8 0

3 years ago

What is the first step to Solving Word Problems?

asambeis [7]

The first step in solving any word problem is to read the problem carefully.

Steps would be as follows:
1- Read the problem carefully
2- Identify what you are trying to find
3- Make a plan
4- Solve the problem
5- Check that your answer makes sense

8 0

3 years ago

Why is 3 + (−5) equal to −2?

tamaranim1 [39]

Answer: since the 5 is a negative you are subtracting it from 3

so 3 +(-5) is actually 3-5. which = -2

Step-by-step explanation:

Hope this helps

5 0

3 years ago

Giving brainliest!!!!!!!!!!

Brrunno [24]

Answer:

I think the answer is D.

Step-by-step explanation:

Well, if you look at the last few sentences in that picture, it says that "he earns money depending how long he babysits." It's a clue to the answer, so the answer is obviously D.

I am also sorry if my answer is wrong. It might be c but please comment on my answer if you disagree/think it's wrong.

5 0

3 years ago

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