2.) random sample by looking in a random interval (k = N/n), where k is an integer by the nearby N/n (N = population, n =. The sample size) from the list of registered alien labor population, workers with the Department of employment. The Ministry of labour and health insurance cards in Mukdahan = 241. People, Nong Khai province Nakhon phanom 1,860 people, 1953 (alien self insurance fund, 2558 (2015)) leading the list of the foreign workers in each province to come sorted by code and by random lottery. Until the sample size each province 210 anniversary people until 3 provinces is 630 people.
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