A Point Estimator Refers to an Estimator That Provides a Single
A point estimator refers to an estimator that provides a single value.
If the expected value of a sample mean equals the population mean,the sample mean is biased.
For any sample size n,the sampling distribution of is normal if the population from which the sample is drawn is uniformly distributed.
For any population X with expected value µ and standard deviation σ,the sampling distribution of will be approximately normal if the sample size n is sufficiently small.As a general guideline,the normal distribution approximation is justified when n < 30.