unit 2

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YBLUVNGNBVZUVYKFSJFC EQMDYDKYPWPUCHEQGZPL PHOFTGCZRUNGPJEZKUNU SNPVJBYNVSAUESRSMNIS OPNBAVKOBKQNSRUYMNLT WTREATMENTJQHIHSWDGE CONTROLCDUPDMAHTDNKR CONFOUNDINGCDPZEFICB YDMWZQPMQEVKODTMELOK JSVQORGIHHFQVEQATBLC ITXQPOOYPJXSBHWTABBO TRUNCONVENIENCEIJPYW RANDOMIZATIONTSCRHDC BTCFQCCUATECCAKGATFR TIXIEHQROWOGDMRJJDNJ IFREPLICATIONPLACEBO VIKNLSFSXGYQIWZFLVEZ XEEKBAQLHUSONPDJEEEY FDWKXIAQVVJHMSZXSZTJ ETJNLBUSSRSEPBTDQHNV
1.
SRS
2.
stratified
3.
cluster
4.
systematic
5.
convenience
6.
treatment
7.
placebo
8.
blind
9.
block
10.
matchedpairs
11.
confounding
12.
replication
13.
randomization
14.
control
15.
bias