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lisabon 2012 [21]
2 years ago
13

PLS HELPPPP I NEED AN ANSWER ASAP WILL GIVE BRAINIEST

Mathematics
1 answer:
brilliants [131]2 years ago
7 0

Answer:

∠1 and ∠2, ∠7 and ∠8

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A toy manufacturer wants to know how many new toys children buy each year. A sample of 305 children was taken to study their pur
Harrizon [31]

Answer:

The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.

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 - 0.8}{2} = 0.1

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.1 = 0.9, so Z = 1.28.

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 = 1.28\frac{1.5}{\sqrt{305}} = 0.1

The lower end of the interval is the sample mean subtracted by M. So it is 7.6 - 0.1 = 7.5

The upper end of the interval is the sample mean added to M. So it is 7.6 + 0.1 = 7.7

The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.

8 0
3 years ago
Please help!!<br> i will mark as brainliest
Viktor [21]

Step-by-step explanation:

okay

I think you should use the method of tan 30

and then find x by using pythagorean theorem

4 0
3 years ago
In January, you deposit $16 in your checking account. Each month, you deposit $15 more than you did the month before. How much m
Leya [2.2K]
You would put 151 dollars in your account at October.
16+15+15+15+15+15+15+15+15+15=151

6 0
3 years ago
Read 2 more answers
Determine if (-2,5) is a solution of Of 3x+4y=14
Serggg [28]
Well that's easy. Just plug in the numbers: 3*(-2)+4*(5)=14. So yes the solution is correct.
8 0
3 years ago
a shipping company delivered 38728 letters and 41584 packages. write and solve an equation to find how many items the company de
kolbaska11 [484]

38,728 + 41,584 = 80,312

The company delivered 80,312 items.

7 0
3 years ago
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