biostats : lecture 4

Central limit theorem

For any population with mean i and standard deviation o, the distribution of sample means for sample size n will have a mean of u and a standard deviation of o/Vn and will approach a normal distribution as n approaches infinity.

Sum of X is an unbiased estimate of

U

__ samples are desirable yield more precise estimates

Larger samples are desirable yield more precise estimates

standard error decreases with ___ sample size

standard error decreases with increasing sample size