2 pts Question 16 Which of the following UX metrics is commonly used as one measure of the "efficiency" of completing a task? time on task levels of success online survey binary success - Previous Next Not saved Submit | } Question 17 2 pts You review a usability testing report that states that 5 participants completed Task 1 with no assistance, 5 participants completed Task 1 with assistance, and 2 participants did not complete Task 1. These results indicate that: The study involved use of levels of success. The study included measurements of time-on-task The definitions for task success and task failure were not clearly defined for this study. Participant ratings for this product were very positive. Previous Next > Nat saved Submit 6090) 2 Question 18 2 pts In a usability test, a participant is asked to use a specified website to find the cost of textbooks for a college course. The task was completed successfully and the total time for the participant to complete the task was 110 seconds. A review of a video recording of this test indicated that for most of this time, the participant was looking at the website without making a physical action. The time that the participant spent looking at the website without making a physical action would be considered: learnability lostness cognitive effort binary success Question 19 2 In a usability test, an error is generally considered to be: ratio data a measure of central tendency an action that does not lead to the desired outcome unrelated to the design of the product being tested Previous Next Question 20 2 pt An application is designed so that a specific task can be completed with 7 clicks. A usability test is conducted and the mean number of clicks to complete this task is 13. These data indicate that: The current design supports optimal efficiency for this task. No participant was able to complete this task. The current design does not support optimal efficiency for this task. A levels of success metric was used in this study