Errors remembering position of information in computer user-interface test
This diagram illustrates that the p-value puts a numerical value to the scale of the type of diagram used in the previous page — it describes whether the data are consistent with the null hypothesis, H0.
The p-value is an index of credibility for the null hypothesis, ยต = 0.
Also mention that the interpretation of the p-value is identical for all hypothesis tests, regardless of the details of H0 and HA.
In an assessment of the user-interface of a computer program, sixteen users are shown a screen containing typical output for 10 seconds. Each user is then asked to indicate the position on the screen of a particular piece of information. The vertical distance between the indicated location and the actual location is recorded from each individual. (These 'errors' are negative if the user indicated too low a position.)
Do the users tend to pick the location of the item correctly, or is there a tendency to point too high or low? This question is equivalent to asking whether there is evidence that the underlying population mean of the 'errors' is different from zero.