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Sophie [7]
4 years ago
10

How do researchers select a sample that is representative of its population

Chemistry
1 answer:
tiny-mole [99]4 years ago
7 0

Explanation:

Using stratified random sampling, researchers must identify characteristics, divide the population into strata, and proportionally choose individuals for the representative sample. ... For example, individuals who are too busy to participate will be under-represented in the representative sample.

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State Newton law of gravitation ?​
xeze [42]

Answer:

Newton's law of universal gravitation. Newton's law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.

Explanation:

That's the definition hope it helps.

7 0
3 years ago
What is the most likely fate of a protein with an N-terminal hydrophobic sorting signal and an additional internal hydrophobic d
scoundrel [369]

Explanation:

The  fate of a protein with an N-terminal hydrophobic sorting signal and an additional internal hydrophobic domain of 22 amino acids.When it is in the translocation channel and emitted laterally into the membrane, the hydrophobic region is known as a trans-membrane domain.

4 0
3 years ago
What type of crystals does iodine, dry ice (CO2) , ice and plastic form?
Elena-2011 [213]
Molecular crystals does iodine, dry ice (CO2) , ice and plastic form. It is becuase<span> is that all four are made of nonmetal elements.Which implies any compounds are made up of molecule.</span>
4 0
3 years ago
Mercury (Hg) poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes l
alisha [4.7K]

Answer:

6 x 10⁵ kg Hg

Explanation:

The mass of mercury in the entire lake is found by multiplying the concentration of the mercury by the volume of the lake.

The volume of the lake is calculated in cubic feet:

V = (SA)x(depth) = (100mi²)(5280ft/mi)² x (20ft) = 5.57568 x 10¹⁰ ft³

Cubic feet are then converted to mL (1cm³=1mL)

(5.57568 x 10¹⁰ ft³) x (12in/ft)³ x (2.54cm/in)³ = 1.578856752 x 10¹⁵ mL

The mass of mercury is then found:

m = CV = (0.4μg/mL)(1g/10⁶μg)(1kg/1000g) x (1.578856752 x 10¹⁵ mL) = 6 x 10⁵ kg Hg

3 0
3 years ago
What are Valence Electrons?
Gekata [30.6K]
Valence electrons are the electrons that are in an atom's outermost layer. 
Every atom is made of protons, neutrons, and electrons.
Electrons are outside them both.
They have energy levels (number of electrons per layer)
And the number they have on the farthest layer are the valence electrons. 

5 0
3 years ago
Read 2 more answers
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