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3 years ago

If there is a very weak correlation between two variables, then the coefficient of determination must be:__________.

Mathematics

1 answer:

maxonik [38]3 years ago

6 0

Answer:

zero

Step-by-step explanation:

The coefficient of determination (R², or the square of the linear correlation coefficient r) is an indicator that allows us to judge a simple linear regression quality. It measures the fit between the model and the observed data or how well the regression equation is suited to describe the distribution of points.

A strong correlation between two variables is usually greater than 0.8. A weak correlation between two variables is usually less than 0.5, but a very weak correlation between two variables will be near zero.

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Factorisation of ax^2 + bx + c

tigry1 [53]

Answer:

-5(t+3)(t-6)

Step-by-step explanation:

-5²+15+90

= -5(t²-3t-18)

= -5(t+3)(t-6)

6 0

3 years ago

A rectangular solid with a square base has a volume of 4096 cubic inches - determine the dimensions that yield the minimum surfa

Bumek [7]

Answer:

side of base, a = 10.1 inches, height, h = 40.1 inches

Step-by-step explanation:

Volume of rectangular solid, V = 4096 cubic inches

Let the side of base is a and the height is h.

$V = a^2h\\\\4096 = a^2 h ..... (1)$

surface area of the solid

$S = 2a^2 + 4 ah \\\\S = 2a^2 + 4 \times a \times \frac{4096}{a^2} from (1)\\\S = 2a^2 + \frac{4096}{a}\\\\\frac{dS}{da}= 4 a - \frac{4096}{a^2}\\\\4 a - \frac{4096}{a^2} = 0 \\\\a^3 = 1024\\\\a =10.1 inches$

So, h = 40.2 inches

5 0

3 years ago

Jessica found that the perimeter of her kitchen table was 18 feet. She found the area of her kitchen table to be 18 square feet.

zloy xaker [14]

6 feet and 3 feet 6x3=18 for the area and 6+6+3+3= 18 for the perimeter

3 0

3 years ago

What is the area? 20 in 25 in square inches

slava [35]

Answer:

250 in sq

Step-by-step explanation:

Here's the solution

=> Base = 25in

=> Height = 20in

=>We need to find out area of traingle

=> Area of traingle = 1/2*base *height

=> Area = 1/2*20*25

=> Area= 250 in sq

hope it helps. ^_^

7 0

3 years ago

Read 2 more answers

I need help with 1-4

sukhopar [10]

1-4 will equal -3 because if you look on a number line and move 4 to the LEFT of 1 it will take you to -3. I hope this helps you! and have a great day!

4 0

3 years ago