In a production process, five production lines L1L5 were chosen at random for study; 11 determinations were

Question:

In a production process, five production lines L1–L5 were chosen at random for study; 11 determinations were made for each production line. The differences between the benchmark number of items expected to be produced per unit time and the actual number produced were recorded; the data are presented as follows: image text in transcribed Assuming a fixed effects model, are the production lines operating on average at the same level? Test at 1% level of significance. Obtain the fitted values, and extract the residuals. Using the residuals, carry out tests to determine whether the normality and equal variance assumptions are satisfied.