Researchers from the United Kingdom studied the effect of two breathing frequenc

Question

Researchers from the United Kingdom studied the effect of two breathing frequencies on performance times and on several physiological parameters in front crawl swimming. The breathing frequencies were one breath every second stroke ( B2) and one breath every fourth stroke ( B4). Subjects were 9 male collegiate swimmers. Each subject swam 200 meters using each breathing frequency: once with breathing frequency B2 and once on a different day with breathing frequency B4. A paper states that the results are expressed as mean plus or minus the standard deviation. One result reported in the paper states that the immediate postexercise heart rate for subjects when using breathing frequency B2 was 161.9 plusminus16 beats per minute. What is the standard error of the mean for these subjects? (Give your answer to three decimal places.) The standard error is squarebox beats per minute

Explanation / Answer

The standrad error of mean is:

root over s^2/n

=root over 16^2/200

=1.131

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