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nikitadnepr [17]

3 years ago

15

in 2013 the population of detroit was 743,204. The population of the city of detroit in the year 1970 was 688,701 greater than i

n 2013. what was the population of detroit in 1970?

2 answers:

irina [24]3 years ago

7 0

1 431 905
Just add them together

NikAS [45]3 years ago

4 0

743,204 + 688,701 = 1431905

The population of Detroit in 1970 was 1,431,905.

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An economist is studying the job market in Denver area neighborhoods. Let x represent the total number of jobs in a given neighb

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Answer:

The sample correlation coefficient is, <em>r</em> = 0.8722.

The equation of the least-squares line is:

$y= -0.161+0.154x$

Step-by-step explanation:

(a)

The scatter diagram displaying the data for <em>X </em>: total number of jobs in a given neighborhood and <em>Y</em> : number of entry-level jobs in the same neighborhood is shown below.

(b)

The table attached below verifies the values of $\sum X,\ \sum Y,\ \sum X^{2},\ \sum Y^{2}\ \text{and}\ \sum XY$ .

The sample correlation coefficient is:

$\begin{aligned}r~&=~\frac{n\cdot\sum{XY} - \sum{X}\cdot\sum{Y}} {\sqrt{\left[n \sum{X^2}-\left(\sum{X}\right)^2\right] \cdot \left[n \sum{Y^2}-\left(\sum{Y}\right)^2\right]}} \\r~&=~\frac{ 6 \cdot 1163 - 201 \cdot 30 } {\sqrt{\left[ 6 \cdot 7759 - 201^2 \right] \cdot \left[ 6 \cdot 182 - 30^2 \right] }} \approx 0.8722\end{aligned}$

Thus, the sample correlation coefficient is, <em>r</em> = 0.8722.

(c)

The slope and intercept are:

$\begin{aligned} a &= \frac{\sum{Y} \cdot \sum{X^2} - \sum{X} \cdot \sum{XY} }{n \cdot \sum{X^2} - \left(\sum{X}\right)^2} = \frac{ 30 \cdot 7759 - 201 \cdot 1163}{ 6 \cdot 7759 - 201^2} \approx -0.161 \\ \\b &= \frac{ n \cdot \sum{XY} - \sum{X} \cdot \sum{Y}}{n \cdot \sum{X^2} - \left(\sum{X}\right)^2} = \frac{ 6 \cdot 1163 - 201 \cdot 30 }{ 6 \cdot 7759 - \left( 201 \right)^2} \approx 0.154\end{aligned}$

The equation of the least-squares line is:

$y= -0.161+0.154x$

(d)

The least-squares line is graphed in the diagram below.

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If the box holds 24 of these sugar cubes,what is the total volume of the box?

mylen [45]

Answer:

$V_{box}=3u^{3}$

Step-by-step explanation:

The complete question is

<em>If the box holds 24 of these sugar cubes what is the total volume of the box.</em>

<em>The sugar cubes are 1/2 x 1/2 x 1/2</em>

<em />

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Last year, a small manufacturing company netted a profit of $540,000. The net profit increased this year by 135%. What is the ne

maks197457 [2]

940,000 is your answer
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540,000+400,000=940,000.
If it’s not that, I’m sorry

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