Suppose that the remission time, in weeks, of leukemia

Chapter , Problem 18

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Suppose that the remission time, in weeks, of leukemia patients that have undergone a certain type of chemotherapy treatment is an exponential random variable having an unknown mean . A group of 20 such patients is being monitored and, at present, their remission times are (in weeks) 1.2, 1.8, 2.2, 4.1, 5.6, 8.4, 11.8, 13.4, 16.2, 21.7, 29, 41, 42, 42.4, 49.3, 60.5, 61, 94, 98, 99.2 where an asterisk next to the data means that the patients remission is continuing, whereas a data point without an asterisk means that the remission ended at that time. What is the maximum likelihood estimate of ?

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