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3 years ago

How can you use random samples of populations to make predictions

Mathematics

2 answers:

defon3 years ago

8 0

Answer:

You can use proportions by settling the ratio from the sample equal to the ratio from the population.

Explanation:

For Example is 3 out of 50 phones in a sample are defective, then an estimated 60 out of 1000 phones in a population are defective. this can be found by solving the proportion 3/50=x/1000 where x is the estimated number of defective phones in the population.

Korolek [52]3 years ago

3 0

Answer:

Proportions which would be equal to the ratio from the sample equal to the ratio from the population.

Step-by-step explanation:

I find that Proportions are the easiest way.

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Find the critical numbers sin^2x+cosx 0 < x< 2pi

ryzh [129]

$\bf sin^2(x)+cos(x)\iff [sin(x)]^2+cos(x)\\\\
-----------------------------\\\\
\cfrac{dy}{dx}=2sin(x)cos(x)-sin(x)\implies 0=2sin(x)cos(x)-sin(x)
\\\\\\
0=sin(x)[2cos(x)-1]\implies 
\begin{cases}
0=sin(x)\\
sin^{-1}(0)=\measuredangle x\\
\pi \\
----------\\
0=2cos(x)-1\\\\ \frac{1}{2}=cos(x)\\\\ cos^{-1}\left( \frac{1}{2} \right)=\measuredangle x\\\\ \frac{\pi }{3},\frac{5\pi }{3}
\end{cases}$

5 0

4 years ago

Lidia is packing her suitcase in the dark, so as to not wake her little sister. She blindly chooses 3 of her 6 sweaters. What is

jonny [76]

There are 6 choose 3 possibilities (combinations).
6C3 = 6!/(6-3)!3!
= 6•5•4/(3•2•1)
= 120/6
= 20
With 20 possibilities, there is a 1 in 20 chance that she will choose her favorite three.
The answer is Option C. 1/20.

7 0

3 years ago

Read 2 more answers

Based on this theory, what distance will the handler move from the starting point to the return point if he creates an arc of a

Gwar [14]

Based on the theory, the distance from the starting point to the return point = Arc length = 109.9 feet.

<h3>What is the Length of an Arc?</h3>

Using the formula for arc length, it is possible to determine the length of an arc that contains a circle by providing the radius and the central angle.

AL = ∅/360 × 2πr

Considering that the new area is a quarter circle in shape, then ∅ = 90°.

Raidus (r) = 70 ft

The distance between the point of departure to the place of departure again= arc length.

Al = ∅/360 × 2πr = 90/360 × 2π(70)

Al = 109.9 feet

In conclusion, According to the hypothesis, the distance from the point of departure to the point of arrival is equal to the length of the arc, which is equal to 109.9 feet.

Learn more about the arc length

brainly.com/question/2005046

#SPJ1

The figure below shows the ideal pattern of movement of a herd of cattle, with the arrows showing the movement of the handler as he moves the herd. The arc the handler makes from the starting point to the return point should be a quarter of a circle: A sector showing a quarter of a circle is drawn. The radius is marked as 70 feet. The endpoints of the arc of the sector are marked as Starting Point and Return Point. The sector is filled with cattle. Based on this theory, what distance will the handler move from the starting point to the return point if he creates an arc of a circle with radius 70 feet? 439.6 feet 3846.5 feet 109.9 feet 1758.4 feet

4 0

2 years ago

At Total Viewing, the

Nataly_w [17]

Answer:

It would be 2242.5

Step-by-step explanation:

1950X0.15=292.5

292.5+1950=2242.5

6 0

2 years ago

Solve each of the following system of equations by substitution!!!<br><br> x-5y=-49<br> y=-2x+1

miss Akunina [59]

Answer:

x = -4, y = 9

(-4, 9)

Step-by-step explanation:

x - 5y = -49

y = -2x + 1

substitute y for -2x + 1

x - 5(-2x + 1) = -49

x + 10x - 5 = - 49

add 5 to both sides

x + 10x - 5 + 5 = - 49 + 5

x + 10x = -44

11x = -44

divide both sides by 11

11x/11 = -44/11

x = -4

substitute x for -4 in any of the original equations

y = -2x + 1

y = -2 * -4 + 1

y = 8 + 1

y = 9

4 0

3 years ago