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
s2008m [1.1K]
2 years ago
11

If the correlation coefficient has a negative value, then the coefficient of determination:_________.a. can take on either a neg

ative or positive value.b. must be positive.c. will also have a negative value.d. will equal zero.
Mathematics
2 answers:
bearhunter [10]2 years ago
8 0
32 hahshshausbehshshehhwhshshbsbshshshhwbshsh shhshshwusbs
GarryVolchara [31]2 years ago
7 0

Answer:

Step-by-step explanation:

The sign of r depends on the sign of the estimated slope coefficient b1:

If b1 is negative, then r takes a negative sign.

If b1 is positive, then r takes a positive sign.

That is, the estimated slope and the correlation coefficient r always share the same sign. Furthermore, because r2 is always a number between 0 and 1, the correlation coefficient r is always a number between -1 and 1.

One advantage of r is that it is unitless, allowing researchers to make sense of correlation coefficients calculated on different data sets with different units. The "unitless-ness" of the measure can be seen from an alternative formula for r, namely:

r=∑ni=1(xi−x¯)(yi−y¯)∑ni=1(xi−x¯)2∑ni=1(yi−y¯)2−−−−−−−−−−−−−−−−−−−−−−−√

If x is the height of an individual measured in inches and y is the weight of the individual measured in pounds, then the units for the numerator is inches × pounds. Similarly, the units for the denominator is inches × pounds. Because they are the same, the units in the numerator and denominator cancel each other out, yielding a "unitless" measure.

Another formula for r that you might see in the regression literature is one that illustrates how the correlation coefficient r is a function of the estimated slope coefficient b1:

r=∑ni=1(xi−x¯)2−−−−−−−−−−−−√∑ni=1(yi−y¯)2−−−−−−−−−−−√×b1

You might be interested in
Which inequality correctly orders the numbers -5,-3, and 2 from greatest to least?
lozanna [386]

Answer:

1) 2 > -3 > -5

Step-by-step explanation:

that is mathematically correct

8 0
2 years ago
Read 2 more answers
-845 degree coterminal angle
meriva
Check the picture below.

with negative angles, we go "clockwise", the same direction a clock hands move.

so -360-360-125 = -845.

so as you see in the picture, you go around twice, and then a little bit more, an extra 125°, landing you at -125°, or its positive counterpart, 235°.

6 0
2 years ago
At one​ store, Julia saved ​$10 with a coupon for 40​% off her total purchase. At another​ store, the ​$29 she spent on books is
barxatty [35]
Let "a" and "b" represent the values of the first and second purchases, respectively.
  0.40*(original price of "a") = $10
  (original price of "a") = $10/0.40 = $25.00 . . . . divide by 0.40 and evaluate
  a = (original price of "a") - $10 . . . . . . Julia paid the price after the discount
  a = $25.00 -10.00 = $15.00

At the other store,
  $29 = 0.58b
  $29/0.58 = b = $50 . . . . . . . divide by the coefficient of b and evaluate

Then Julia's total spending is
  a + b = $15.00 +50.00 = $65.00

Julia spent $65 in all at the two stores.
6 0
3 years ago
-2/3m = -12 please explain how to solve.
vichka [17]

Answer:

m = 18

Step-by-step explanation:

-2/3m = -12

multiply both sides of the equation by 3:

-2/3m(3) = -12(3)

simplify:

-2m = -36

divide both sides by -2:

-2m/-2 = -36/-2

simplify:

m = 18

3 0
2 years ago
Read 2 more answers
Two teachers purchase supplies for their classrooms.
inna [77]

Answer:

Cost of One Journal =  $3.99

Cost of One pen =  $0.59

Step-by-step explanation:

Let

Cost of One Journal = x

Cost of One pen = y

We can make equation from given statements.

Mr. Bowden purchases 18 journals and 40 pencils for $95.42.

18x+40y=95.42

Ms. Jacinto purchases 11 journals and 16 pencils for $53.33.

11x+16y=53.33

Now solving these equations to find the value of x

18x+40y=95.42--eq(1)\\11x+16y=53.33--eq(2)

Multiply eq(1) with 2 and eq(2) with 5

36x+80y=190.84\\55x+80y=266.65\\-\:\:\:\:-\:\:\:\;\:\:\:\:\:\:\:-\\---------\\-19x=-75.81\\x=\frac{-75.81}{-19}\\x=3.99\\

We get the value of x is: x=3.99

Now, putting value of x in equation 1 to find value of y.

18x+40y=95.42\\18(3.99)+40y=95.42\\71.82+40y=95.42\\40y=95.42-71.82\\40y=23.6\\y=\frac{23.6}{40}\\y= 0.59

So, we get the value of y: y = 0.59

Now, finding the costs:

Cost of One Journal = x = $3.99

Cost of One pen = y = $0.59

7 0
2 years ago
Other questions:
  • Two parallel lines are crossed by a transversal.
    7·2 answers
  • What is the product?
    10·2 answers
  • What is the value of n in 9x27+2x31-28=n
    7·2 answers
  • James is 60 years old. His age is 8 years more than twice Maggie's age. How old is Maggie?
    9·2 answers
  • Help me on #16 ASAP! Please explain!
    14·1 answer
  • Can anyone help me. greatly appreciate
    12·1 answer
  • Mr.Pope is buying Mrs. Pope's flowers. He buys 6 flowers for 10.95 without tax.
    10·2 answers
  • At most, Alana can spend $40 on carnival tickets. Ride tickets cost $4 each, and food tickets cost $2 each. Alana buys at least
    14·1 answer
  • AB=<br> Round your answer to the nearest hundredth
    14·1 answer
  • Topic is Sets, please help​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!