DS 17.4.3 contains a data set of failure times in days of a certain type of electric motor. Exact failure times are observed when the motor fails to operate correctly and needs replacing. Right-censored observations, denoted with an asterisk, occur when a motor is replaced while it is still operating successfully.
(a) Construct and graph the product limit estimator of the reliability function for the electric motors.
(b) Construct a 95% confidence interval for the probability that an electric motor operates successfully for at least 200 days