Students in Dr. Branch's physics class were calculating the average time required for one complete period of a pendulum bob. They set up five pendulums and timed the swing for each one twenty-five
times. Then they calculated the average period time.
One set of data varied significantly from the other sets. What could be one source of unavoidable
error that influenced the data?
Select one:
a. Not starting the timer at exactly the "go" call.
O b. Reading the stopwatch incorrectly.
O c. Stopwatch starts with one second on the clock.
O d. Students not paying attention to data collection