59. The reaction time (RT) to a stimulus is the interval of time commencing with stimulus presentation and ending with the rst discernible movement of a certain type. The article Relationship of ReactionTime and Movement Time in a Gross Motor Skill (Percept.

Motor Skills, 1973: 453—454) reports that the sample average RT for 16 experienced swimmers to a pistol start was .214 sec and the sample standard deviation was .036 sec.

a. Making any necessary assumptions, derive a 90% CI for true average RT for all experienced swimmers.

b. Calculate a 90% upper con dence bound for the standard deviation of the reaction time distribution.

c. Predict RT for another such individual in a way that conveys information about precision and reliability.