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Harlamova29_29 [7]
3 years ago
11

The main idea of estimation is that a. data from the population is used to estimate unknown population parameters b. data from t

he sample is used to estimate unknown population parameters c. data from the sample is used to estimate unknown sample statistics d. data from the population is used to estimate unknown sample statistics e. None of the above
Mathematics
1 answer:
Darya [45]3 years ago
4 0

Answer:

B. Data from the sample is used to estimate unknown population parameters.

Step-by-step explanation:

Estimation is a mathematical approach of ascertaining data which is almost equal or similar to the true data. To get a proper estimate, data is obtained from a sample, (that is a small collection of data), and is then used to obtain the projected population parameter.

Data is said to be overestimated when it surpasses the true value, and underestimated when it falls below the true value. Estimates simply provide an idea of what the exact or accurate value should be.

It has wide applications in mathematics when figures are approximated, as well as in business in making future predictions which inform present decisions.

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A = 40
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NO LINKS!!!
Ber [7]

Refer to this previous solution set

brainly.com/question/26114608

===========================================================

Problem 4

Like the three earlier problems, we'll place the kicker at the origin and have her kick to the right. The two roots in this case are x = 0 and x = 20 to represent when the ball is on the ground.

This leads to the factors x and x-20 and the equation y = ax(x-20)

We'll plug in (x,y) = (10,28) which is the vertex point. The 10 is the midpoint of 0 and 20 mentioned earlier.

Let's solve for 'a'.

y = ax(x-20)\\\\28 = a*10(10-20)\\\\28 = -100a\\\\a = -\frac{28}{100}\\\\a = -\frac{7}{25}\\\\

This then leads us to:

y = ax(x-20)\\\\y = -\frac{7}{25}x(x-20)\\\\y = -\frac{7}{25}x*x-\frac{7}{25}x*(-20)\\\\y = -\frac{7}{25}x^2+\frac{28}{5}x\\\\

The equation is in the form y = ax^2+bx+c with a = -\frac{7}{25}, \ b = \frac{28}{5}, \ c = 0

The graph is below in blue.

===========================================================

Problem 5

The same set up applies as before.

This time we have the roots x = 0 and x = 100 to lead to the factors x and x-100. We have the equation y = ax(x-100)

We'll use the vertex point (50,12) to find 'a'.

y = ax(x-100)\\\\12 = a*50(50-100)\\\\12 = -2500a\\\\a = -\frac{12}{2500}\\\\a = -\frac{3}{625}\\\\

Then we can find the standard form

y = ax(x-100)\\\\y = -\frac{3}{625}x(x-100)\\\\y = -\frac{3}{625}x*x-\frac{3}{625}x*(-100)\\\\y = -\frac{3}{625}x^2+\frac{12}{25}x\\\\

The graph is below in red.

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