For each of the following, tick [✓] one box to indicate whether the experimental technique would reduce random error, systematic error or neither. The first row has been completed as an example.
The measurement of a particular time interval is repeated many times. The readings are found to vary. The results are shown in the figure below.
Fig 17
The true value of the time interval is 
.
State how the readings on Fig. 17 show the presence of
a systematic error,
a random error.
State the expected changes to Fig. 17 for experimental measurements that are
more accurate,
more precise.
