Soy sauce producer developed new soy sauce products with less salt content. The company decides to test consumer liking of the new soy sauce formula containing 5%(A), 10% (B) and 15%(C) salt content in 6 different regions of Thailand. There are known regional differences in the consumer base. In addition, the consumers tested soy sauce products at three different time of the day of testing. The mean of consumer liking score is as follows.

4.1) Type of experimental design ...................................................................................... 4.2) Factor ................................................ Number of factor(s) .................................. 4.3) Treatment ........................................... Number of treatment(s) ............................. 4.4) Block (if applicable) ............................... Number of block(s) ..................................... 4.5) Response(s) ..................................................................... 4.6) Number of experimental unit(s): ......................................