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%.
The variation from sample to sample, when the poll is repeated, is described by the standard deviation (1.6 percent) . We would like this variation to be small so that repeated polls give almost the same result. To reduce the standard deviation, we could:

A) use a simple random sample of size less than 1,000.
B) use a simple random sample of size greater than 1,000.
C) use a confidence level less than 95 percent.
D) use a confidence level greater than 95 percent.
E) use a simple random sample of size greater than 1,000, and use a confidence level less than 95 percent.