Two samples of electronic components were tested in two different testing conditions see results below (Consider YZ = 70). The first test at 353K was suspended after 250 hrs. Estimate:

(a) The 90% two sided intervals for the MTTF for each of the temperatures. (b) The one sided confidence interval for the MTTF for both 90% and 95% confidence. (c) Based on the one-sided values, find the reliabilities at 100 hrs for both confidences and temperatures, assuming constant failure rate.

353K (80 degrees C) 55h FAIL 63h FAIL 80h FAIL (110+YZ)h FAIL 250 h SUSPENDED 373K (100 degrees C) 13 h FAIL 15 h FAIL 30 h FAIL 41 h FAIL 57 h FAIL 93 h FAIL 100+YZ/10 h FAIL 353K (80 degrees C) 55h FAIL 63h FAIL 80h FAIL (110+YZ)h FAIL 250 h SUSPENDED 373K (100 degrees C) 13 h FAIL 15 h FAIL 30 h FAIL 41 h FAIL 57 h FAIL 93 h FAIL 100+YZ/10 h FAIL