b) Using the exact format provided below, show all calculations in providing the percentage of issues that would be identified with a sample of 2, 4, 6 and 8 users, respectively. Percentages 2 users: Calculations 4 users: Calculations 6 users: Calculations 8 users: Calculations 8 marks c) Report on what you notice and conclude by stating how the results contribute to the debate on the number of participants required in usability studies to reliably identify usability issues. What I have noticed Your answer Conclusion Your answer 5 marks d) Consider the table below. It contains more data collected with the ATM usability test. Rather than reporting results separately for each task, one can combine all the results into one "overall" score to answer the question - is the new ATM good enough or not? Note: It does not mean one cannot report the results separately. Such information may assist the developers to gain an understanding of where exactly they need to focus to improve the ATM. No. of errors Satisfaction (1-7) New functions rating (1-7) Participant Tasks completed (of 10) P1 9 P2 10 P3 8 4 3 9 4 000 3 6 5 00 8 5 5 P4 6 1 4 6 P5 7 2 lin 5 5 P6 00 8 8 4 st 2 P7 9 3 3 6 P8 10 4 1 3 3 P9 8 1 4 8 6 P10 Ave 10 9 2 6 4 5 4 Copy the table and add 5 columns (Tasks, Accuracy, Satisfaction, New functions and Average) to the right of the table (see Tables 8.5 and 8.6 for examples). Convert each of the metrics to a percentage. Once that is done, calculate an average percentage for each of the five columns. 10 marks