Question

A random sample of n = 15 heat pumps of a certain type yielded the following observations on lifetime (in years):

2.0	1.5	6.0	1.7	5.2	0.4	1.0	5.3
15.7	0.5	4.8	0.9	12.2	5.3	0.6

(a) Assume that the lifetime distribution is exponential and use an argument parallel to that of this example to obtain a 95% CI for expected (true average) lifetime. (Round your answers to two decimal places.)

________ and _________ years

(b.) What is a 95% CI for the standard deviation of the lifetime distribution? [Hint: What is the standard deviation of an exponential random variable?] (Round your answers to two decimal places.)

________ and _________ years

Answer 1

please like if it helps