Table 2 Research Hypotheses,,
"Regression model 
hypothesis",Interpretation,
H: ?q2 - ?q1 > 0,Block repair is incomplete; not to good as new.,
H: ?q3  > 0,The repair fraction of good as new is decreasing.,
H: ?q4  > 0,The failure rate increases with the time since block repair.,
H: ?q5 > 0,There is an accelerated failure rate with increasing time since repair.,