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    The t Test for Two Related Samples

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    22. In the Preview section of this chapter, we discussed a report describing how the accuracy of Olympic marksmen can be affected by heartbeats. Pelton (1983) reported that Olympic - level marksmen shoot much better if they fire between heartbeats rather than squeezing the trigger during a heartbeat. The small vibrate 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 series of rounds while a researcher records heartbeat. 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  = .05.

    Participant During Between
    Heartbeats Heartbeat

    A 93 98
    B 90 94
    C 95 96
    D 92 91
    E 95 97
    F 91 97
    G 92 95
    H 93 97

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    Solution Summary

    The t test for two related samples are examined.