An engineer studying the occurrence of an event in a certain process, which depends on the time

Question:

An engineer studying the occurrence of an event in a certain process, which depends on the time of the day, and day of the week, had to use a number of observers to record the incidents. Since the occurrences of the event in 5 days of the week were being studied, five observers and five time periods were used to design a 5×5 Latin square experiment. A new set of observers was used each week and the study took 3 weeks. The results obtained are presented as follows: image text in transcribed Latin letters refer to periods of the day. Analyze the data using Case III as the design.