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An accounting firm, prior to introducing in the firm widespread training in statistical sampling for auditing, tested three training mathods:

An accounting firm, prior to introducing in the firm widespread
training in statistical sampling for auditing, tested three training
mathods:
(1) study at home with programmed training materials
(2) training sessions conducted at local offices conducted by
local staff
(3) training sessions in Chicago conducted by national staff

Thirty auditors were grouped into 10 blocks of 3, according to time
elapsed since college graduation, and the three auditors in each block
were randomly assigned to the three training methods. At the end of
the training, each auditor was asked to analyze a complex case involving
statistical applications; a proficiency measure based on this analysis
was obtained for each auditor.

In file audit.dat the columns are
proficiency measure; block; training method


a. Write an appropriate linear statistical model for this randomized
blocks design. List the assumptions and identify terms.

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