Final answer:
The sample is biased as it is not random and does not include the opinions of all the students.
Step-by-step explanation:
The sample is biased. Although the data is collected from a population of 100 5th grade students, the sample is not random. Only five students playing dodge ball outside at recess are asked about their preference of playing indoors or outdoors. This sample is not representative of the entire population, as it does not include the opinions of other students.