Each of 16 students measured the circumference of a tennis ball by four different methods, which were: Method A: Estimate the circumference by eye.
To estimate the circumference of a tennis ball by eye, each student can follow these steps:
1. Hold the tennis ball in one hand and visually judge its size.
2. Estimate the distance around the tennis ball, as if you were measuring its circumference.
3. Use your thumb, fingers, or any other reference point to measure the estimated circumference.
4. Try to be as precise and accurate as possible in your estimation.
Note: The accuracy of this method may vary depending on each person's perception and ability to estimate measurements.