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3 years ago

Suppose a prediction equation was built on training data yielding:

Mathematics

1 answer:

Radda [10]3 years ago

7 0

Answer:

3.04

Step-by-step explanation:

Given the prediction equation:

y_hat = 145.5 -5.5*x

- - - - x - - - - - - - - - у

1 - - 10.36 - - - - 87.87

2 - - 9.96 - - - - 89.83

3 - - 12.50 - - - - 71.61

1) y_hat = 145.5 -5.5*(10.36)

y_hat = 145.5 - 56.98 = 88.58

2) y_hat = 145.5 -5.5*(9.96)

y_hat = 145.5 - 54.78 = 90.72

3) y_hat = 145.5 -5.5*(12.50)

y_hat = 145.5 - 68.75 = 76.75

Root mean squared error (RMSE) :

Number of observations (n) = 3

√(Σ(y_hat - y)^2) / n

y_hat = predicted value

y = actual value

Σ[(88.58-87.87)^2+(90.72-89.83)^2+(76.75-71.61)]

Σ(0.71^2) + (0.89^2) + (5.14^2)

27.7158 / 3 = 9.2386

√9.2386

= 3.0395065

= 3.04

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Juliette [100K]

First add 7d to both sides:
-22 = 11d
Now divide by 11 both sides
-2 = d

You can work on either side of the equation, I used the right side for the variables because it was easier to add to positive numbers than dealing with negative numbers on the left side:
-7d -4d = 22
-11d =22
d = -2

either way you get the same answer :)

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3 years ago

Amuseumcharges forgeneraladmission and exhibitions. Admission and 3 exhibitionscosts $45. Admission and 5 exhibitionscosts $65.

leonid [27]

Answer:

The price of the admission is 15.

Step-by-step explanation:

From the information given, you can write the following equations:

a+3e=45 (1)

a+5e=65 (2), where:

a is the admission cost

e is the exhibition cost

First, you can solve for a in (1):

a=45-3e (3)

Second, you can replace (3) in (2):

45-3e+5e=65

45+2e=65

2e=65-45

2e=20

e=20/2

e=10

Finally, you can replace the value of e in (3):

a=45-3e

a=45-3(10)

a=45-30

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According to this, the price of the admission is 15.

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3 years ago

Does cold salty water sink or rise along the ocean floor as deep as a current

rewona [7]

Answer:

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Step-by-step explanation:

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2 years ago

Please help idk thisssss

Alekssandra [29.7K]

ANSWER
$0.073 \% = 0.00073$

EXPLANATION

Recall that,

$\% = \frac{1}{100}$

That is why
$100\%$
is equivalent to
$1.$

This implies that,

$0.073\% = 0.073 \times \frac{1}{100}$

This is the same as,

$0.073\% = \frac{0.073}{100}$

When we are dividing by
$100$
we move the decimal point backwards two times.

This implies that,

$0.073\% = 0.00073$

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3 years ago

Read 2 more answers

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stiks02 [169]

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Step-by-step explanation:

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