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

question 15

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%.
Which of these ranges of outcomes contains 95 percent of all the results of a large number of polls of 1,000 teens?

• A) 56 to 100 percent
• B) 54.4 to 57.6 percent
• C) 52.8 to 59.2 percent
• D) 51.2 to 60.8 percent

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Definitions:

Active Transport

The movement of molecules across a cell membrane from a region of lower concentration to one of higher concentration, requiring energy.

Muscle Hypertrophy

The increase in muscle size and mass due to exercise, particularly strength training.

Fibrosis

A pathological process characterized by the accumulation of excess fibrous connective tissue in an organ or tissue.

Refractory Period

The period immediately following the transmission of an impulse in nerve or muscle cells during which a second impulse cannot be generated.