What need to be done in step 4 i did not understood

what is to be written in analysis file i dont have a clue

In this file, you need to mention the process that you followed to reach your answer.

For example you ran top command , then did something and then did something else and you found the faulty version

You should also include the the statistics of the faulty version and show that it was higher than the benchmark values
For example, if the cpu usage of the faulty version is 60 percent and that of benchmark value is 5 percent then you can describe this scenario in simple english.