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.

Question

Quizplus · Accepted Answer

Lack of bias refers to the characteristic of a sampling method where the expected value of the sample mean equals the population mean, indicating that the sampling method accurately represents the entire population without systematic error. In this context, the fact that the distribution of results is centered at the true population percentage (56%) demonstrates the lack of bias in the simple random sampling method used.

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