A Surprising Fact: Only 56% of All Teens Use a Password

question 26

Multiple Choice

A surprising fact: only 56% of all teens use a password on their mobile device. If a poll chooses a simple random sample of 1000 teens and asks if they use a password on their mobile device, the percent who say "Yes" will vary if the sample is repeated. In fact, the percent "Yes" in many samples will follow a normal distribution with mean 56% and standard deviation 1.6%.
Although the result will vary if the poll is repeated, the distribution of results is centered at the truth about the population (56 percent) . We call this desirable property of a simple random sample:

• A) lack of bias.
• B) low variability.
• C) symmetry.
• D) the confidence level.

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Definitions:

Oxidation

A chemical reaction involving the loss of electrons by a molecule, atom, or ion, often associated with gaining oxygen or losing hydrogen.

Reduction

A chemical reaction involving the gain of electrons or the decrease in oxidation state by a molecule, atom, or ion.

Oxidizing Agent

A substance that has the ability to oxidize other substances, meaning it gains electrons in the process.

Reagents

Substances or compounds that are added to a system in order to bring about a chemical reaction or to see if a reaction occurs.