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3 years ago

Please help me, i have the answer but i need to make sure its correct

Mathematics

2 answers:

Zigmanuir [339]3 years ago

7 0

Answer:

the area of that shape is 17, if you got that then you'd be correct

hope this helps :)

mixer [17]3 years ago

3 0

If your answer is 17, you've gotten the correct answer.

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Is. 36yd2ft bigger than 114ft 2in

Zarrin [17]

NO!
1 yd=3 ft
36*3=108
108+2=110
114>110, therefore no

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4 years ago

Subtract I need help^_^

trapecia [35]

The answer to this subtraction is d

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3 years ago

nick drove at a rate of 60 mph for 2 2/3 hours. then he drove another 1 1/2 hours at a speed of 45 mph. how far did he travel?

arsen [322]

He traveled 227.5 miles.

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4 years ago

Suppose a 90% confidence interval for the mean salary of college graduates in a town in Mississippi is given by [$38,737, $50,46

JulsSmile [24]

Answer:

a. The point estimate was of $44,600.

b. The sample size was of 16.

Step-by-step explanation:

Confidence interval concepts:

A confidence interval has two bounds, a lower bound and an upper bound.

A confidence interval is symmetric, which means that the point estimate used is the mid point between these two bounds, that is, the mean of the two bounds.

The margin of error is the difference between the two bounds, divided by 2.

a. What is the point estimate of the mean salary for all college graduates in this town?

Mean of the bounds, so:

(38737+50463)/2 = 44600.

The point estimate was of $44,600.

b. Determine the sample size used for the analysis.

First we need to find the margin of error, so:

$M = \frac{50463-38737}{2} = 5863$

Relating the margin of error with the sample size:

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 Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.05 = 0.95$ , so Z = 1.64.

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.

For this problem, we have that $\sigma = 14300, M = 5863$ . So

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

$5863 = 1.645\frac{14300}{\sqrt{n}}$

$5863\sqrt{n} = 1.645*14300$

$\sqrt{n} = \frac{1.645*14300}{5863}$

$(\sqrt{n})^2 = (\frac{1.645*14300}{5863})^2$

$n = 16$

The sample size was of 16.

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3 years ago

Rectangle JKLM undergoes a sequence of transformations, resulting in rectangle J’K’L’M’. The length of side K’L’ is 6 units. The

madreJ [45]

Answer:

J,F,K

Step-by-step explanation:

J,F,K

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3 years ago