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

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.