MATHEMATICS HIGH SCHOOL

7 find the value of the linear correlation coefficient r: the paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands). cost 9 number 85 2 3 52 55 4 68 2 5 67 86 83 9 10 73 a) 0.708 b) 0.246 c) -0.071 d) 0.235

Answers

Answer 1

Answer:

The value of the linear correlation coefficient, r, as calculated using Microsoft excel is: 0.708,

The linear correlation coefficient, r, using Excel spreadsheet

Step1: Open Microsoft excel spreadsheet

Step2: Entre the cost of advertising on one column, and the number of products sold on another column.

Step3: Select a blank cell and input the formula: =CORREL(B3:B10, C3:C10)

Step4: Press "entre" to get the value of the linear correlation coefficient.

Therefore, the value of the linear correlation coefficient, r, as calculated using Microsoft excel is 0.708.

For such more questions about linear correlation coefficient:

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A librarian has weekend off and has 10 paid vacation days per year
What adds to negative ten and multiplies to six
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Select all that apply.Which of the following expressions could you use to estimate 47% of 89? 1/2 · 90 0.5 · 90 0.47 · 89 90/2
Someone help me with this proof please

Solve the following equation for "h": A=bh/2

Answers

If I read it correctly, I believe that it solves out to 2A/b=h.

2A/b=h is the correct answer.

A line has the equation y= 6x + 19 What are the coordinates of the y-intercept of the line

Answers

Answer:

coordinates of y- intercept = (0, 19 )

Step-by-step explanation:

the equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

y = 6x + 19 ← is in slope- intercept form

with slope m = 6 and y- intercept c = 19 or in coordinate form (0, 19 )

3.) What are the solutions to x^2 + 8x + 7 = 0?x = –8 and x = –7

x = –7 and x = –1

x = 1 and x = 7

x = 7 and x = 8

Answers

check if x = -8 is the solution
1. substitute number -8 for x in the equation
(-8)^2 + 8*(-8) + 7 = 0
2. do calculations on the left size
64 -64 + 7 = 0
7 = 0
3. equality means x is the solution, inequality means it is not
-8 is not the solution to x^2 + 8x + 7 = 0

check other given numbers the same way
x=-7
(-7)^2 + 8*(-7) + 7 = 0
0=0
-7 is the solution

x=-1
(-1)^2 + 8*(-1) + 7 = 0
0=0
-1 is the solution

x=1
(1)^2 + 8*(1) + 7 = 0
16=0
1 is not the solution

x=7
(7)^2 + 8*(7) + 7 = 0
113=0
7 is not the solution

x=8
(8)^2 + 8*(8) + 7 = 0
135=0
8 is not the solution

answer:
The solutions to given equation are -7 and -1.

The answer to this question is
-7+-1=-8
-1+-7=8
1+7=8

A set of equations is given below:Equation E: a = 5b + 1
Equation F: a = 3b + 4

Which statement describes a step that can be used to find the solution to the set of equations?

Equation F can be written as 5b + 1 = 3b + 4.
Equation F can be written as b + 1 = 3b + 4.
Equation F can be written as a = 3(a − 1) + 4.
Equation F can be written as a = 5(a − 4) + 1.

Answers

Answer:

Equation F can be written as 5b + 1 = 3b + 4

Step-by-step explanation:

A set of equations is given below:

Equation E: a = 5b + 1

Equation F: a = 3b + 4

In substitution method we solve the equation for a variable and substitute it in other equation

Given a= 5b +1

Also equation F : a= 3b+4

both equation have 'a' on the left hand side

So we substitute 5b+1 for 'a' in second equation

Substitute 5b+1 in the place of 'a' in Equation F

Equation F can be written as 5b + 1 = 3b + 4

the answer is A because they are equal to eachother

In the diagram, point O is the center of the circle and mADB = 43°. If mAOB = mBOC, what is mBDC?A) 45°
B) 43°
C) 41°
D) 37°
E) 33°

Answers

The answer is B) 43°
Angle ADB is an inscribed angle which means arc AB has an angle twice that of angle ADB. The angle of the arc would be the same as that of the central angle AOB. So, mAOB = 86°. And since, mAOB = mBOC, then mBOC = 86° and arc BC has a measure of 86° as well. Angle BDC intercepts the arc BC which means half of the angle of arc BC is mBDC. So, mBDC = 43°.

It is B 43. This is correct for sure.

10 POINTS AND BRAINLIEST! Calculate the area of the trapezoid, which is not drawn to scale.