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vesna_86 [32]
2 years ago
11

A certain video game costs $35 and there is 4% sales tax what is one way to determine what the amount of sales tax will be

Mathematics
1 answer:
Licemer1 [7]2 years ago
4 0

Answer:

$1.40

Step-by-step explanation:

Find 4% of $35.

4% of $35 = 0.04 × $35 = $1.40

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Answer:

n=\frac{0.5(1-0.5)}{(\frac{0.04}{1.64})^2}=420.25  

And rounded up we have that n=421

Step-by-step explanation:

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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 90% of confidence, our significance level would be given by \alpha=1-0.90=0.1 and \alpha/2 =0.05. And the critical value would be given by:

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

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And on this case we have that ME =\pm 0.04 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)  

We assume that a prior estimation for p would be \hat p =0.5 since we don't have any other info provided. And replacing into equation (b) the values from part a we got:

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Answer:

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3 years ago
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