1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sophie [7]
3 years ago
10

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

Chemistry
1 answer:
tiny-mole [99]3 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.

You might be interested in
Describe how radioactive isotopes are used to treaat cancer​
stich3 [128]

Answer:

Radioisotope therapy is a procedure in which a liquid form of radiation is administered internally through infusion or injection. RIT's ultimate purpose is to treat cancerous cells with minimal damage to the normal surrounding tissue. These therapies are not normally the first approach used to fight a patient's cancer.

Explanation:

5 0
2 years ago
Write a balanced overall reaction from these unbalanced half-reactions sn and ag
loris [4]
Balance each one by adding electrons to make the charges on both sides the same:

Sn--> Sn2+ + 2 e-
Ag+ + 1 e- --> Ag

Now, you have to have the same number of electrons in the two half-reactions, so multiply the second one by 2 to get:

2 Ag+ + 2 e- --> 2 Ag

Now, just add the two half reactions together, cancelling anything that's the same on both sides:

2 Ag+ + Sn --> Sn2+ + 2 Ag

And you're done.
8 0
3 years ago
How many mL of a stock solution of 2.00 M KNO3 are needed to prepare 100.0 mL of 0.15M KNO3? with work plz
Tatiana [17]
Using the law of dilution :

Mi x Vi =  Mf x Vf

2.00 x Vi = 0.15 x 100.0

2.00 x Vi = 15

Vi = 15 / 2.00

Vi = 7.5 mL

hope this helps!


3 0
3 years ago
Nvmmmmmmmmmmmmmmmmmmmmmmmmm lol
Vlad1618 [11]

Answer:

coooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooool lol

Explanation:

7 0
3 years ago
Read 2 more answers
Mass does not change during a chemical change. is the same true for physical change?
Mashutka [201]

Answer:

Mass states that mass is neither created nor destroyed in a chemical reaction or a physical transformation

Explanation:

4 0
3 years ago
Other questions:
  • Using the Law of Conservation of Matter, determine the number of grams of iron sulfide (FeS) that will be produced in this react
    7·2 answers
  • What did the professer use a catalyst for the flubber experiment
    9·1 answer
  • What volume will 2.50 mol of hydrogen (H2) occupy at -20.0 °C and 1.5 atm?
    13·1 answer
  • In standardizing a naoh solution a student found that 25.55cm of base neutralize exactly 21.35cm of 0.12M HCl find the molarity
    11·1 answer
  • How is the akin of frog similar to a fish​
    5·1 answer
  • What is the formula for mass number?
    6·1 answer
  • If 8.500 g CH is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final
    11·1 answer
  • What is the Sl unit for energy? Be sure to give the full name for the unit
    14·1 answer
  • Question 3 (1 point)
    14·2 answers
  • The electrophilic bromination or chlorination of benzene requires ______ along with the halogen.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!