I have tried to understand it using an excel sheet which I downloaded from elsmar.com. Still i have some queries.
1. as per MSA 4th ed, page 198, the F-value for interaction (0.434) has been compared with F(0.05,18,60) i.e. 0.99999 whreas in the downloaded excel sheet it has been compared with F(0.25,18,60) i.e. 0.513. Which method should I use?
2. There is another column in table A4 marked as 'EMS' on page 198 of manual. What is the use of EMS while taking decision about the measuring system.
3. on page 197, on top, there is a text like " ... compare the F-static to an upper percentage point of an F distribution with numerator and denominator degree of freedom..... Is this another method of comparing P-value with alpha level..
The excel shhet is attached herewith.
Kindly help.
Rameshwar