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Veseljchak [2.6K]
3 years ago
12

Which of the following statements represents a difference between a sample survey and an observational study? A) Presence of pop

ulation. B)Inclusion of numerical data. C)People are aware that they are participating. D)Ability to collect information.
Mathematics
2 answers:
LekaFEV [45]3 years ago
8 0

Answer: C) People are aware that they are participating.

The sample survey is the technique which is initiates after taking proper consent from the participants by explaining the purpose of study and then data is collected which can be in the form of output of measurements, opinion about a cause or issue. But the observational study does not explain the purpose of the study to the participants, it just involves the data collection.

Therefore, on the basis of the above description, People are aware that they are participating. is the relevant option.

alexira [117]3 years ago
6 0

Answer:

c seems most likely from the given answers

Step-by-step explanation:


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Step-by-step explanation:

\frac{ {13}^{6}  \div  {13}^{8}  \times  {13}^{ - 4} }{ {13}^{ - 2} }

You need to remember the properties of exponents: multiplication adds the exponents, division subtracts the exponents.

If you multiply two powers with the same base, the result will be the base to the sum of the powers.

If you divide two powers with the same base, the result will be the base to the difference of the powers.

In your case you will this:

{13}^{6 - 8 + ( - 4) - ( - 2)}

That is:

{13}^{ - 4}

Or:

\frac{1}{ {13}^{4} }

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greatest common factor=gcf

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