Empirical Methods in Software Engineering

I Read the following scenario and answer the questions accordingly: Pair programming (PP) is a well-known software development practice that has been studied and applied in academia and industry setting. A total of 295 professional Java consultants frominternational consultancy companies in Norway, Sweden, and the UK were hired to participate in a controlled experiment on pair programming. The subjects used professional Java tools to perform several change tasks on two alternative Java systems with different degrees of complexity. One group of programmers developed a small Java program using PP, while the other (control group), used individual programming. It is expected that PP practice will yield code with superior code quality when compared with code developed by individual programmer. Additionally, it is believed that programmers who practice PP will develop code faster than programmers who develop code individually. External code quality was assessed based on the number of defects detected. Programmer's productivity was measured by the time (hours) taken to complete the tasks. Answer the following questions: 1. What are the independent and dependent variables in this experiment and the metrics used to measure these variables? (4 marks) 2. Write possible hypothesis (null and alternative) for this experiment (2 marks) 3. What is the most appropriate experimental design that should be applied? (2 marks) 4. What is the most appropriate analysis approach for this empirical study? (2 marks)