An article in Medicine and Science in Sports and Exercise \"Maximal Leg-Strength

Question

An article in Medicine and Science in Sports and Exercise "Maximal Leg-Strength Training Improves Cycling Economy in Previously Untrained Men," (2005, Vol. 37 pp. 131-1236) studied cycling performance before and after eight weeks of leg-strength training. Seven previously untrained males performed leg-strength training three days per week for eight weeks (with four sets of five replications at 85% of one repetition maximum), peak power during incremental cycling increased to a mean of 315 watts with a standard deviation of 16 watts. Construct a 98% two-sided confidence interval for the mean peak power after training. Assume population is approximately normally distributed. Round the answers to 2 decimal places.

Explanation / Answer

Ans:

sample mean=315

sample standard deviation=16

n=7

df=7-1=6

critical t value=tinv(0.02,6)=3.143

98% confidence interval for mean

=315+/-3.143*(16/sqrt(7))

=315+/-19.01

=(295.99,334.01)

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