Final answer:
The percentage of feedback presentations across a set of trials is the relative frequency of feedback. This is found by dividing the frequency of feedback by the total number of instances in the sample and converting the result into a percentage.
Step-by-step explanation:
The percentage of feedback presentations across a set of trials is the relative frequency of feedback. Relative frequency is calculated by taking the frequency of an observed value of data and dividing it by the total number of data values in the sample. For example, if you have data on the number of students who gave feedback during trials, and 15 students gave feedback out of a total of 100 students, the relative frequency would be calculated as 15/100, which can be converted to a percentage (15%).
When analyzing data, it is useful to know how often a value appears. The relative frequency provides this information by indicating the proportion of the sample that corresponds to a particular value. For instance, frequency tells us that 3 students work two hours while relative frequency converts this into a proportion of the total sample, such as 3/20 or 15% if there are 20 students in total.