Hi can you please explain how to solve Q2.1 and 2.2?

the relevant data is attached below. A and B represent 2 engineers and the numbers 1-9 represent how many days the engine worked before failing.

94 You are attempting to determine whether there is a difference between the engines 95 manufactured by your supplier in terms of time in days until failiure depending on which 96 of your two mechanics is working on maintenance. 97 98 The data for the five engines and the two mechanics is prestented in the table below: 99 100 - "{r Q2 data} 101 Q2