how can i solve this question please

2) A company has two different facilities, factory A and factory B, which they use to manufacture a certain type of solid state drive (SSD). The company wants to investigate the means and standard deviations of the SSD lifetimes coming from the two factories. Lifetime is measured in number of terabytes read/written (TBRW) to the SSD before it fails. Suppose that 12 SSD's are tested from factory A and found to have a sample mean lifetime of 1420 TBRW, with sample standard deviation of 120 TBRW. From factory B, 14 SSD's are tested and found to have a sample mean lifetime of 1560 TBRW, with sample standard deviation of 160 TBRW. a) [2] Construct a 95% condence interval on the mean lifetime of SSD's from factory A. b) [3] Construct a 95% condence interval on the standard deviation of the lifetime of SSD's from factory A. c) [4] Construct a two-sided 95% condence interval on the difference in mean lifetimes of SSD's from the two factories. d) [1] on the basis of your result in (c), can you say that there is a signicant difference between the lifetimes of the SSD's produced by the two plants