4. 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.

Participant	Tasks completed (of 10)	No. of errors	Satisfaction (1-7)	New functions rating (1-7)
P1	9	4	3	3
P2	10	9	4	6
P3	8	8	5	5
P4	6	1	4	6
P5	7	2	5	5
P6	8	8	4	2
P7	9	3	3	6
P8	10	4	1	3
P9	8	1	4	2
P10	10	8	6	6
Ave	9	5	4	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

5. Assume the following goals have been set before the usability test:
   • Fifty percent of users will be able to complete at least 5 tasks
   • No user should make more than 5 errors for all the tasks
   • More than 70% of users should agree that they are satisfied with the new ATM
   • More than 50% of users should "somewhat agree" that they find the new ATM functions useful

Based on these goals (i.e., have they been met?), how would you rate the usability of the new ATM? 4 marks

6. Based on the overall score (the far-right column average presented in the bottom row), provide an interpretation of the usability of the new ATM. 4 marks

7. Assume Participant 1 and Participant 2 made two errors that were the same. What is the total number of unique errors they made? 2 marks