The times to failure of certain electronic components in accelerate environment tests are 15, 28, 3, 12, 42, 19, 20, 2, 25, 30, 62, 12, 18, 16, 44, 65, 33, 51, 4, and 28 minutes. Looking upon these data as a random sample from an exponential population, use the results of Exercise 12.21 and Theorem 12.2 to test the null hypothesis θ = 15 minutes against the alternative hypothesis θ ≠ 15 minutes at the 0.05 level of significance.(Use ln 1.763 = 0.570.)