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3 years ago

WILL MARK BRAINLEIST PLEASE HURRY

Mathematics

2 answers:

vivado [14]3 years ago

8 0

Answer:

Anwser is 1.01

Step-by-step explanation:

You find the mean of both and subtract 39.23-38.22=1.01

Mama L [17]3 years ago

4 0

Answer:

It is actually not any of the answers. It is actually 0.76

Step-by-step explanation:

Mean = (40.55 + 41.51 + 42.01 + 38.76 + 36.32 + 34.28 + 35.38 + 37.48 + 40.87 + 48.32 + 41.59 + 42.71)/12 = 39.98 seconds.

In this case, the outlier comes to be the data: 48.32. If we don't consider that data point, the mean equals:

Mean = (40.55 + 41.51 + 42.01 + 38.76 + 36.32 + 34.28 + 35.38 + 37.48 + 40.87 + 41.59 + 42.71)/11 = 39.22

The difference is: 39.98 - 39.22 = 0.76

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A research group needs to determine a 90% confidence interval for the mean repair cost for all car insurance small claims. From

lutik1710 [3]

Answer:

a) $z = 1.645$

b) The should sample at least 293 small claims.

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 Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$ , which means that the answer of question a is 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.

(b) If the group wants their estimate to have a maximum error of $12, how many small claims should they sample?

They should sample at least n small claims, in which n is found when

$M = 12, \sigma = 124.88$ . So

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

$12 = 1.645*\frac{124.88}{\sqrt{n}}$

$12\sqrt{n} = 205.43$

$\sqrt{n} = \frac{205.43}{12}$

$\sqrt{n} = 17.12$

$\sqrt{n}^{2} = (17.12)^{2}$

$n = 293$

The should sample at least 293 small claims.

8 0

2 years ago

Why should my xbox be in my room

Tema [17]

So you can play? I guess...

4 0

3 years ago

Read 2 more answers

Solve d over r equals t for r

lana66690 [7]

D/r=t
d=tr
d/t=r

so r=d/t

7 0

3 years ago

I NEED HELP PLEASE WITH PART 2, THANKS!

EleoNora [17]

Steps to solve:

-6w - 8 + 15w = 2w - 8 + 7w

~Combine like terms

9w - 8 = 9w - 8

~Add 8 to both sides

9w = 9w

~Divide 9 to both sides

0 = 0

All real numbers are solutions.

Set builder notation: {x | R}

Best of Luck!

8 0

3 years ago

I will give brainiest to whoever answers correctly !!

Helen [10]

Answer:

Step-by-step explanation:

7 0

3 years ago