4. the statistics. (สถิติที่ใช้)
1. the average (Mean) is taking all the data back together, and then divided by the number of existing data. To use a formula to calculate the average value as follows:
2. percentage (Percentage) is the most popular statistics as well as a comparison of the frequency or frequencies to a number or the total number of matches is 100 percent searches from the following formula:
3. standard deviation (Standard Deviation) is a measure of the distribution is very popular to write instead. S.D. or S
4. IOC is the precision of the questionnaire.