6.

6. (sampling): (population, universe)() . : vs. (study population): ( ) (): ()(sampling frame): 1 (probability sampling) vs. (non-probability sampling) mission: . (random sampling) (EPSEM: Equal Probability of Selection Method). (convenient sampling)

? : () 5 (: ) ( 30 ) 1,500 2,000

Sampling Error () = * ()Standard Error() (standard deviation) Simulation of sampling distribution() . : , . . mu, sigma / root of n. 95% 2 , 99.7% 3 . 5 paperk@ (:)KBS155~17875~9351013~18371~20~319~26MBC154~17867~895~713~183~51~30~218~24SBS162~18168856~1110~182~60~40~519~25YTN160~18472886~1011~152~52~41~314~21 1538114185302518 (simple random sampling)(table of random numbers) (random number generator)Random.org (282) (systematic sampling) (287)(stratified random sampling) , (287) (multistaged cluster sampling) : . , . : 1,0001: 100 () ( ) 2: 20( 5) (293)