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 14 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 2 was 153 ± 17 beats per minute what are x and the standard error of the mean for these subjects? (This exercise is also a warning to read carefully: that 153 ± 17 is not a confidence interval, yet summaries in this form are common in scientific reports. Round your standard error to three decimal places.) beats per minute beats per minute x-

Explanation / Answer

We have the mean = 153 beats per minute.

The Standard deviation as per the given equation is 17.

The standard error is given as SD/sqrt(n), where n is the number of observations.

Therefore SE = 17/sqrt(14) = 4.543 beats per minute.

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