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Orlov [11]
3 years ago
15

A bank withdrawal of $50

Mathematics
1 answer:
Kryger [21]3 years ago
3 0
A bank withdrawal of $50 is a reasonable amount for the average American person.
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14) You and your friend to out to eat and the cost of the meals
MaRussiya [10]

Answer:

The tip would be $3.90 and rounded to the nearest dollar would be $4.00

Step-by-step explanation:

4 0
3 years ago
We guess, based on historical data, that 30% of graduating high-school seniors in a large city will have completed a first-year
Annette [7]

Answer:

n=\frac{0.3(1-0.3)}{(\frac{0.025}{1.96})^2}=1290.78  

And rounded up we have that n=1291

Step-by-step explanation:

1) Previous concepts

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}})

2) Solution to the problem

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 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96

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 0.025 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{0.3(1-0.3)}{(\frac{0.025}{1.96})^2}=1290.78  

And rounded up we have that n=1291

4 0
3 years ago
Help me pls and can u also explain if u want
Dafna1 [17]
Everything is "=" except 5/12.

Good luck! :)
8 0
3 years ago
Read 2 more answers
Leon earns$14 an hour.How much does he earn in 4 weeks if he works 12 hours each week?
gavmur [86]
Let's brake this up. He earns 14 dollars per hour. Then he works 12 hours per week. So 14 times 12 is 168. 168 times 4 equals 672 dollars :P
4 0
3 years ago
Read 2 more answers
I have figured this question out up to here but I don't know what to do next (can you please show you're working)
kogti [31]
The picture is not there what is the question 
8 0
2 years ago
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