To prevent the storage of incomplete questionnaires or to prevent unexpected movement of the samples it collected additional data, 10% of the sample group, therefore, in this study using a sample size of 238 people.
To prevent data were missing. Or to protect the expected movement of the sample. We also collect information about the other 10% of the sample, so in this study used a sample size of 238 persons.
To prevent data were incomplete. Or to prevent the deviate of sample. Thus the data more 10% from samples. Therefore, this study used a sample size 238 .