When conducting an observational study, it is important to choose a topic, select a variable, create a hypothesis, collect the data, and analyze the data for validity of the hypothesis. Which additional step is also crucial to the success of the study?Observational study
Nonrandomized study
Sample survey
Experimental study

Answers

Answer 1

Answer: The right answer for the question that is being asked and shown above is that: "Nonrandomized study."

The additional step is also crucial to the success of the study is that Nonrandomized study. When conducting an observational study, it is important to choose a topic, select a variable, create a hypothesis, collect the data, and analyze the data for validity of the hypothesis.

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What is the ratio equivalent to 18:8
Solve for x. 12:15 = x:5
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What is the area of a parallelogram when the height is 10 and the base is 15

Answers

Answer:

150

Step-by-step explanation:

it is just like finding the area of a rectangle! 10*15=150

Answer:

150

Step-by-step explanation:

A=bh

A=15×10

A=150

Can someone please explain how I would figure this out

Answers

[1], [3] => a = 49,000/2 = 24,500 => b +c = 24,500 => c = 24,500 - b;
[2] => 25*24,500 + 20b + 15c = 1,052,000 => 20b + 15c = 1,027,500;
20b + 15*(24,500 - b) = 1,027,500 => 5b = 733,500 => b = 146,700 =>
c = - 122,200;

Show that (4-√3)(4+√3)/√13 simplifies to root 13

Answers

13 is a prime number, there is no simpler form for its square root .

A container holds 50 electronic components, of which 10 are defective.1. If 6 components are drawn at random from the container, the probability that at least 4 are not defective is ?
A) 0.26
B) 0.42
C) 0.75
D) 0.91
E) 1.00
2. If 8 components are drawn at random from the container, the probability that exactly 3 of them are defective is ?
A) 0.147
B) 0.203
C) 0.300
D) 0.375
E) 0.750

Answers

1.) q = P(defective) = 10/50 = 0.2
p = P(not defective) = 1 - P(defective) = 1 - 0.2 = 0.8
P(x) = nCr p^x q^(n-x)
P(x ≥ 4) = P(4) + P(5) + P(6) = 6C4 * (0.8)^4 * (0.2)^2 + 6C5 * (0.8)^5 * 0.2 + (0.8)^6 = 15 * 0.4096 * 0.04 + 6 * 0.32768 * 0.2 + 0.262144 = 0.24576 + 0.393216 + 0.262144 = 0.90112
Option D is the correct answer.

2.) p = P(defective) = 10/50 = 0.2
q = P(not defective) = 1 - P(defective) = 1 - 0.2 = 0.8
P(x) = nCr p^x q^(n-x)
P(x = 3) = 8C3 * (0.2)^3 * (0.8)^5 = 8C3 * 0.008 * 0.32768 = 56 * 0.008 * 0.32768 = 0.1468
Option A is the correct answer.

Can you explain 3x+4/5=7/10. Solve

Answers

$3x+ (4)/(5)= (7)/(10)\ \ | -(4)/(5)\n \n3x+ (4)/(5) -(4)/(5)= (7)/(10)-(4)/(5)\n \n3x = (7)/(10)-(8)/(10) \n \n3x = -(1)/(10) \ \ /*(1)/(3)\n \nx=-(1)/(30)$

$or \n \n (3x+ 4)/(5)= (7)/(10) \ \ /*10 \n \n 2(3x+4)=7\n \n6x+8 = 7\ \ |-8$

$6x+8-8=7-8\n \n6x=-1\ \ /:6 \n \n x=-(1)/(6)$

$3x+ (4)/(5)= (7)/(10) \n \n3x= (7)/(10)-(4)/(5)\n \n3x=(7)/(10)-(8)/(10)\n \n3x=- (1)/(10) \ /:3\n \nx=-(1)/(10)\cdot (1)/(3)\n \nx=-(1)/(30)$

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$(3x+4)/(5) = (7)/(10) \n \n10(3x+4)=5\cdot 7\n \n30x+40=35\n \n30x=35-40\n \n30x=-5\ /:30\n \nx=- (5)/(30) \n \nx=-(1)/(6)$

Answer keys r in bottom (8th grade math) i think u have to simplify it or smth

Answers

$\boxed{11} \n\n\n \cfrac{(-21)^(-4)\cdot (-4)^0 }{3^(-5)\cdot 7^(-9)}\implies \cfrac{(-21)^(-4)\cdot 1 }{3^(-5)\cdot 7^(-9)}\implies \cfrac{(-21)^(-4)}{3^(-5)\cdot 7^(-9)}\implies \cfrac{3^5\cdot 7^9}{(-21)^4}$

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