Based on the experience of the researchers said that if using the estimation method, the sample size must be a minimum of 100-150 samples (Hair & CTG 1998). Also according to Bollen, 1989, the minimum sample size is 5 samples for 1 parameter to estimate luong.Trong this study used the questionnaire survey of 35 questions. Including 5 questions to gather information of customers interviewed, the expected sample size n = 175 is set.
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