1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
trasher [3.6K]
3 years ago
5

A stonemason wants to look at the relationship between the density of stones she cuts and the depth to which her abrasive water

jet cuts them. The data show a linear pattern with the summary statistics shown below: mean standard deviation x=x=x, equals stone density \left( \dfrac{\text{g}}{\text{cm}^3} \right)( cm 3 g ​ )left parenthesis, start fraction, start text, g, end text, divided by, start text, c, m, end text, cubed, end fraction, right parenthesis \bar{x}=2.5 x ˉ =2.5x, with, \bar, on top, equals, 2, point, 5 s_x=0.3s x ​ =0.3s, start subscript, x, end subscript, equals, 0, point, 3 y=y=y, equals cutting depth (\text{mm})(mm)left parenthesis, start text, m, m, end text, right parenthesis \bar{y}=41.7 y ˉ ​ =41.7y, with, \bar, on top, equals, 41, point, 7 s_y=42s y ​ =42s, start subscript, y, end subscript, equals, 42 r=-0.95r=−0.95r, equals, minus, 0, point, 95 Find the equation of the least-squares regression line for predicting the cutting depth from the density of the stone. Round your entries to the nearest hundredth.
Mathematics
1 answer:
garik1379 [7]3 years ago
3 0

Answer: y=374.2 -133 x

​Step-by-step explanation: I just did the khan test

Least-squares regression equation

The equation for the least-squares regression line for predicting yyy from xxx is of the form:

\hat{y}=a+bx

y

^

​

=a+bxy, with, hat, on top, equals, a, plus, b, x,

where aaa is the yyy-intercept and bbb is the slope.

Hint #22 / 4

Finding the slope

We can determine the slope as follows:

b=r\left(\dfrac{s_y}{s_x}\right)b=r(

s

x

​

s

y

​

​

)b, equals, r, left parenthesis, start fraction, s, start subscript, y, end subscript, divided by, s, start subscript, x, end subscript, end fraction, right parenthesis

In our case,

b=-0.95\left(\dfrac{42}{0.3}\right)=-133b=−0.95(

0.3

42

​

)=−133b, equals, minus, 0, point, 95, left parenthesis, start fraction, 42, divided by, 0, point, 3, end fraction, right parenthesis, equals, minus, 133

Hint #33 / 4

Finding the yyy-intercept

Because the regression line passes through the point (\bar x, \bar y)(

x

ˉ

,

y

ˉ

​

)left parenthesis, x, with, \bar, on top, comma, y, with, \bar, on top, right parenthesis, we can find the yyy-intercept as follows:

a=\bar y-b\bar xa=

y

ˉ

​

−b

x

ˉ

a, equals, y, with, \bar, on top, minus, b, x, with, \bar, on top

In our case,

a=41.7 +133 (2.5)=374.2a=41.7+133(2.5)=374.2

You might be interested in
HELP PLEASE
alexandr1967 [171]

Answer:

I attached the image that has all of the elements. If I missed something, please let me know and I will fix it.

8 0
2 years ago
What is the answer of this question?​
polet [3.4K]

Answer:

116

Step-by-step explanation:

8.2 / 2 = 4.1

a = \sqrt{7^{2}-4.1^{2} } = 5.6736

0.5 x 8.2 x 5.6736 = 23.2618

23.2618 x 5 = 116.309 = 116

7 0
3 years ago
jOHN HAS 50 DOLLARS IN HIS WALLET, sUZANNAH HAS 30 DOLLARS WHAT PERCENTAGE OF JOUN'S MONEY DOES SUZANNAH HAVE?
ira [324]

Answer:

60%

Step-by-step explanation:


4 0
3 years ago
-3x+4y=-4 -2x+5y=9<br>solve the following system of equations
Vesnalui [34]

the answer is x= 8, and y=5

3 0
3 years ago
Read 2 more answers
Angle relationships with parallel lines
bekas [8.4K]

Answer:

<h3>X=180 degree</h3>

<h3>X=180-103</h3>

<h3>X=77 degree </h3>

<h3>Hope it helps u</h3>

7 0
3 years ago
Other questions:
  • Janice wants to buy a tie as a birthday girft for her dad.A store has discounted all of its ties so that they are all 25% off th
    6·2 answers
  • Why in the world did I have nearly 800 points worth of questions deleted? Every single one of them were right! What do I do now?
    13·1 answer
  • The greatest integer that satisfies the inequality 1.6−(3−2y)&lt;5
    10·1 answer
  • What is the slope of a line that passes through the points (2, 0) and (5, 0)? Explain.
    6·2 answers
  • What is the Slope-intercept? ​
    11·2 answers
  • Please hurry I have 2 more weeks of school I need to pass
    14·2 answers
  • Is this a reflection
    14·1 answer
  • Let n be a natural number such that n + 1, n + 3, n + 7, and n + 9 are prime numbers. Additionally, the numbers n + 31, n + 33,
    5·1 answer
  • 1. Let C be between D and E. Use the Segment addition Postulate to solve for v.
    11·1 answer
  • In 1990, Dawn gross pay was $48,000.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!