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vampirchik [111]
2 years ago
11

Each of the

Mathematics
1 answer:
lana66690 [7]2 years ago
4 0

Step-by-step explanation:

(4,8+8,9+14,19+20)/4=11,9725

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Evaluate the expression.<br> 8 - 9: (7 + 2)
VLD [36.1K]

Answer:

-1(x+9) i hope this helps of not l sorry!

5 0
3 years ago
An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by th
monitta

Answer:

a) n =1623

b) ME=2.0538\sqrt{\frac{0.21 (1-0.21)}{1623}}=0.0208    

Step-by-step explanation:

1) Notation and definitions

n random sample taken

\hat p=0.19 estimated proportion of customers are not satisfied with the service provided by the local dealer

Confidence =0.96 or 96%

Me= 0.02 represent the margin of error

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{p(1-p)}{n}})

Part a

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 96% of confidence, our significance level would be given by \alpha=1-0.96=0.04 and \alpha/2 =0.02. And the critical value would be given by:

z_{\alpha/2}=-2.0538, z_{1-\alpha/2}=2.0538

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.02 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

And replacing into equation (b) the values from part a we got:

n=\frac{0.19(1-0.19)}{(\frac{0.02}{2.0538})^2}=1622.912  

And rounded up we have that n=1623

Part b

The margin of error is given by:

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    

So then if w replace the value of n obtained from part a we got:

ME=2.0538\sqrt{\frac{0.21 (1-0.21)}{1623}}=0.0208    

3 0
3 years ago
Write the equation of the line that passes through the points (-4,-7) and (8,7). Put your answer in fully reduced point-slope fo
Nikitich [7]
Yes u r correct sorry I need pointdjdjfkkcfk
6 0
3 years ago
Choose the equation below that represents the line passing through the point (-2, -3) with a slope of -6. (1 point)
wolverine [178]

Answer:

the last one

Step-by-step explanation:

plug in -2 for x and -3 for y

8 0
2 years ago
In one month, Claudia rides her favorite bike trail 12 times. She travels a total distance of 1182 km. What is the length of Cla
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The length of the trail is 98.5 KM, all you need to do is divide the total distance by the number of times she went on it.
4 0
3 years ago
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