By storing the query number per store, 77 total 385 series set to random. Select a sample from each shop using a random accident (Accidental Sampling) from people who come. Service in the restaurant may 2558 (2015)
By collecting 77 percent of questionnaire template set includes 385 randomly selected samples from each batch using a random coincidence (Accidental Sampling) from public sources. Service in the restaurant in May 2558.
The questionnaire sample restaurant 77 series, including the 385 series, randomly selected from each store random chance. (Accidental Sampling) from the people. Service in the restaurant in the May of 2558.