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
astraxan [27]
2 years ago
7

Which statement is correct?

Mathematics
2 answers:
cupoosta [38]2 years ago
8 0
The answer should be A
Pavel [41]2 years ago
5 0

Answer:

i think the answer is a

Step-by-step explanation:

a yard = 3 feet

1 foot * 3 = yard

You might be interested in
Five observations taken for two variables follow.
I am Lyosha [343]

Answer:

a) Figure attached

b) If we see the scatter plot we can conclude that the possible relation between x and y is linear and with a positive correlation since when the values of x increases the values for y increases as well.

c) Cov (X,Y) = \frac{\sum_{i=1}^n (x_i -\bar X)(y_i -\bar Y)}{n-1}

We can find the numerator like this:

\sum_{i=1}^5 (6-16)(6-10)+(11-16)(9-10)+(15-16)(6-10)+(21-16)(17-10)+(27-16)(12-10)=106

And then:

Cov(X,Y) = \frac{106}{5-1}=26.5

d) r=\frac{5(906)-(80)(50)}{\sqrt{[5(1552) -(80)^2][5(586) -(50)^2]}}=0.693  

Step-by-step explanation:

Part a

For this part we use excel in order to create the scatterplot and we got the result on the figure attached.

Part b

If we see the scatter plot we can conclude that the possible relation between x and y is linear and with a positive correlation since when the values of x increases the values for y increases as well.

Part c

The sample covariance is defined as:

Cov (X,Y) = \frac{\sum_{i=1}^n (x_i -\bar X)(y_i -\bar Y)}{n-1}

We can find the numerator like this:

\sum_{i=1}^5 (6-16)(6-10)+(11-16)(9-10)+(15-16)(6-10)+(21-16)(17-10)+(27-16)(12-10)=106

And then:

Cov(X,Y) = \frac{106}{5-1}=26.5

Part d

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

And in order to calculate the correlation coefficient we can use this formula:  

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

For our case we have this:

n=5 \sum x = 80, \sum y = 50, \sum xy = 906, \sum x^2 =1552, \sum y^2 =586  

r=\frac{5(906)-(80)(50)}{\sqrt{[5(1552) -(80)^2][5(586) -(50)^2]}}=0.693  

So then the correlation coefficient would be r =0.693

3 0
3 years ago
Can someone plz help me with this
bearhunter [10]
Hello!

The equation 5*18 equals 90.  So, there are nine tens in this equation's answer.

Have a wonderful day!  :)

-L

6 0
3 years ago
Read 2 more answers
What is 2+6 100 points the answer is 8 right?
Elan Coil [88]

Answer:

yes it is 8

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
What is the volume of the prism below?
sveta [45]

Answer:

The answer is the second option

Step-by-step explanation:

V=Bh

4 0
3 years ago
Read 2 more answers
Please help!!<br>show work!!<br>please!!
Advocard [28]
\frac{1}{1} *  \frac{1}{3} would work. 
4 0
3 years ago
Other questions:
  • A little boy stands on a carousel and rotates around the ride 4 times if the distance between the little boy and the center of t
    9·1 answer
  • Classify the triangle based on the side lengths 10, 12 and 23.
    10·2 answers
  • During a recreational football ​game, every spectator placed his or her ticket stub into one of several containers. After the​ g
    6·1 answer
  • Write the equation of a line in slope-intercept form if m=-3 and b=7. help please.
    6·1 answer
  • The perimeter of a rectangle is 200 feet. Describe the possible lengths of a side if the area of the rectangle is not to exceed
    11·1 answer
  • 4)) Solve for r.<br> 10' = 1,000<br> r=
    10·1 answer
  • How many times does 88 go into 382?
    13·2 answers
  • 2(5j + 2 + 4j) as a verbal expression
    14·1 answer
  • WHOEVER ANSWERS FIRST GETS BRAINLIEST AND I NEED AN EXPLANATION PLZ
    9·2 answers
  • Graphs of the functions f and g are given.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!