All categories

3 years ago

We can

Business

1 answer:

V125BC [204]3 years ago

5 0

Answer:

hacking

Explanation:

thats the only way to iterfere

You might be interested in

Assume you have noted the following prices for books and the number of pages that each book contains.Book Pages (x) Price (y)A 5

tigry1 [53]

$a) $y=0.00991 x+1.042$b) $r^2=0.7503^2=0.563$\\C) $r=\frac{7(30095)-(4210)(49)}{\sqrt{\left[7(2595100)-(4210)^2\right]\left[7(354)-(49)^2\right]}}=0.7503$$

x: 500, 700, 750, 590 , 540, 650, 480

y: 7.00, 7.50 , 9.00, 6.5, 7.50 , 7.0, 4.50

We want to create a linear model like this :

$y=m x+b$

Where

$m=\frac{S_{x y}}{S_{x x}}$

And:

$\begin{aligned}& S_{x y}=\sum_{i=1}^n x_i y_i-\frac{\left(\sum_{i=1}^n x_i\right)\left(\sum_{i=1}^n y_i\right)}{n} \\& S_{x x}=\sum_{i=1}^n x_i^2-\frac{\left(\sum_{i=1}^n x_i\right)^2}{n}\end{aligned}$

With these we can find the sums:

$\begin{aligned}& S_{x x}=\sum_{i=1}^n x_i^2-\frac{\left(\sum_{i=1}^n x_i\right)^2}{n}=2595100-\frac{4210^2}{7}=63085.714 \\& S_{x y}=\sum_{i=1}^n x_i y_i-\frac{\left(\sum_{i=1}^n x_i\right)\left(\sum_{i=1}^n y_i\right) n}{=} 30095-\frac{4210 * 49}{7}=625\end{aligned}$

And the slope would be:

$m=\frac{625}{63085.714}=0.00991$

Now we can find the means for x and y like this:

$\begin{aligned}& \bar{x}=\frac{\sum x_i}{n}=\frac{4210}{7}=601.429 \\& \bar{y}=\frac{\sum y_i}{n}=\frac{49}{7}=7\end{aligned}$

And we can find the intercept using this:

$b=\bar{y}-m \bar{x}=7-(0.00991 * 601.429)=1.042$

And the line would be:

$y=0.00991 x+1.042$

Part b

The correlation coefficient is given by:

$r=\frac{n\left(\sum x y\right)-\left(\sum x\right)\left(\sum y\right)}{\sqrt{\left[n \sum x^2-\left(\sum x\right)^2\right]\left[n \sum y^2-\left(\sum y\right)^2\right]}}$

For our case we have this:

$\begin{aligned}& \mathrm{n}=7 \sum x=4210, \sum y=49, \sum x y=30095, \sum x^2=2595100, \sum y^2=354 \\& r=\frac{7(30095)-(4210)(49)}{\sqrt{\left[7(2595100)-(4210)^2\right]\left[7(354)-(49)^2\right]}}=0.7503\end{aligned}$

The determination coefficient is given by:

$r^2=0.7503^2=0.563$

Part c

$r=\frac{7(30095)-(4210)(49)}{\sqrt{\left[7(2595100)-(4210)^2\right]\left[7(354)-(49)^2\right]}}=0.7503$

Learn more about regression line to visit this link

brainly.com/question/7656407

#SPJ4

4 0

1 year ago

According on this lesson, how are individuals and economies similar?

Step2247 [10]

<span>They both must choose how to allocate their resources.</span>

4 0

4 years ago

Read 2 more answers

A record of income and expenditures for a given period of time is called a/an:

Vilka [71]

A record of income and expenditures for a given period of time is called a BUDGET.

4 0

3 years ago

Which of the following is a risk (or potential pitfall) of cost leadership?

Lapatulllka [165]

Answer:

a. Cost cutting may lead to the loss of desirable features

Explanation:

In the business market, sometimes there occurs a price war between the various companies regarding the same type product and each company reduces the price to as minimum as possible to take the cost leadership in the market. Some drawbacks that occur in such a strategy of companies are listed here -

There is a tight control on the expenses during the manufacturing of products which often results in loss of desirable features in the products
No new innovations are made as companies focus mainly of the current product
The feedback of customers seem to be of no importance in such conditions
This strategy promotes the lower quality products in the market

7 0

3 years ago

How would you pay taxes on a earned income?

nasty-shy [4]

You must pay two types of taxes on earned income: Social Security/Medicare taxes (called FICA, OASDI, or payroll taxes) and income taxes. The payroll taxes that are withheld from your paycheck have two components.

3 0

3 years ago