Answer: simple random sample.
Step-by-step explanation:
In the given scenario , the professor is using a lottery system which in term of statistics is known as simple random sampling technique.
In this technique a sample is drawn chosen from the entire population in such a way that all the participants in the population has an equal chance to get chosen.
Here , the professor selects 5 random slips from the jar and the chances of getting selected is equal for each students.
Thus , this is a simple random sample.