Sample size determination
The study used Simple random sampling. The total number of respondents from airline passengers was estimated scientifically using the formula n= (S*Z/e) 2 for an undisclosed large population size. Initially, a pilot study of 50 respondents who does airline travel in the Bangkok region was done for scale refinement and for estimating the standard deviation A Study on “The Study on Low-Cost Airline Customers’ Satisfaction about Automated Check-in-Kiosks provided by Thai Air Asia Airline” (With reference to passengers of Thai Air Asia Airline)score, which got applied for determining the exact population size. Formula for sample size calculation when estimating means (for continuous or interval-scaled variables) are as follows: