Question: Pelton (1983) repoerted that Olympic-level Marksmen shoot much better if they fire between heartbeats rather than sqeezing the trigger during a heartbeat. The small vibration caused by a heartbeat seems to be sufficient to affect the marksmen's aim. The following hypothetical data demonstrate this phenomenon. A sample of n=8 Olympic marksmen fire a series of rounds while a researcher records heartbeats. for each marksman, the total score is recorded for shots fired during heartbeats and for shots fired between heartbeats. Do these data indicate a significant difference? test with a=.05.

Participants During Between

Heatbeats Heartbeats