Estimates the likely closeness of the sample mean to the population mean. Summative test a usability test of a completed product to determine how well it meets its usability objectives. Supplier the producer of a product being considered for purchase. Task scenario the presentation and description of a task as part of a realistic, very short story. Taxonomy the systematic classification of the objects in a field of study.
Test protocol a list of the steps to be followed in the test.
Validation a determination of the validity of a measure such as a questionnaire or a usability test. Variance the sum of squared differences of a set of measurements from their mean , divided by the sample size. Such practitioners know how to design and execute summative performance tests with human subjects and how to analyze the resulting data. Their training is usually an advanced degree in human factors, behavioral science, industrial engineering, human-computer interaction, industrial design, computer science, or a related field.