A temperature-accelerated life test was performed on a type of sheathed tubular heater. Six heaters were tested at each of four temperatures: 1520 F, 1620 F, 1660 F, and 1708 F. The number of hours to failure was recorded for each of the 24 heaters in the study. 1520 F 1620 F 1660 F 1708.F 1953 1190 651 511 2135 1286 837 651 2471 1550 848 651 4727 2125 1038 652 6134 2557 1361 688 6314 2845 1543 729 a. Are any of the treatment effects different from zero? Check this at a=0.05. b . Check model adequacy, and if need be, find a suitable transformation and then check if this fixed the