Problem 10E

An electrical engineer wishes to compare the mean lifetimes of two types of transistors in an application involving high-temperature performance. A sample of 60 transistors of type A were tested and were found to have a mean lifetime of 1827 hours and a standard deviation of 168 hours. A sample of 180 transistors of type B were tested and were found to have a mean lifetime of 1658 hours and a standard deviation of 225 hours. Find a 95% confidence interval for the difference between the mean lifetimes of the two types of transistors.

Day 3 1/12/2016 MSI Session CE12 Tutor: Vaness Putnam email: vputnam@ucsc.edu Monday 5:006:10pm ARCenter 116 Wednesday 11:0012:10pm ARCenter 202 Thursday’s 2:003:10pm Oake’s Learning Center NAND Gate using the brute force realization A B F 0 0 1 0 1 1 1 0 1 1 1 0 look at all the lines that have 1, so on the top we will have three sets of two (something) gates first one is A, B (0, 0), we get one in the output second is A, B’ (0, 1) third is A’, B (1, 0) we need an inverter our original NAND gate had, four transistors (gates) on the bottom (1, 1). We will have one set and it is just going to be A, B the bottom