The Venn diagram illustrates that out of 30 students surveyed, 21 have dogs, 16 have cats, and 8 have both. The remaining students either have only dogs or only cats.
To represent the information in a two-circle Venn diagram:
1. Label one circle "Dog" and the other "Cat."
2. In the "Dog" circle, write the number 21 (total students with a dog).
3. In the "Cat" circle, write the number 16 (total students with a cat).
4. In the overlapping section of the circles, write the number 8 (students with both a dog and a cat).
5. Subtract the overlapping number (8) from the total number of students with a dog (21 - 8 = 13) and write this number outside the overlapping section in the "Dog" circle. This represents the students with only a dog.
6. Similarly, subtract the overlapping number (8) from the total number of students with a cat (16 - 8 = 8) and write this number outside the overlapping section in the "Cat" circle. This represents the students with only a cat.
This representation accurately reflects the given information about the number of students having a dog, a cat, both, or neither, in a clear and concise manner.