An unbiased statistic is one that 1.is closely approximated by ...

[dmcintosh]

An unbiased statistic is one that
  1.is closely approximated by a normal curve.
  2.has the smallest variance.
  3.is mound-shaped.
  4.is nearly symmetric.
  5.does not consistently tend to underestimate or to overestimate the value of a population characteristic.

Question 2

A random sample will be selected from the population of all adult residents of a particular city. The sample proportion will be used to estimate p, the proportion of all adult residents who are registered to vote. For which of the following situations will the estimate tend to be closest to the actual value of p?
   I. n = 210 and p = 0.6
   II. n = 200 and p = 0.6
   III. n = 200 and p = 0.7

  1.I only
  2.II only
  3.III only
  4.II and II only
  5.All three estimates will be equally close to the actual value of p.

[nikmaaacs]

Answer to Question 1

5

Answer to Question 2

3