Cooling down with a cold drink before exercise in the heat is believed to help an athlete perform. Researcher J. Dugas explored the difference between cooling down with an ice slurry (slushy) and with cold water. Ten male participants drank a flavored ice slurry and ran a treadmill in a controlled hot and humid environment. Days later, the same participants drank cold water and ran on a treadmill in the same hot and humid environment. The following table shows the times, in minutes, it took to fatigue on the treadmill for both the ice slurry and the cold water. Subject Cold Water 1 52 2 37 3 44 4 51 5 34 6 38 7 41 8 50 9 29 10. 38 Ice Slurry 56 43 52 58 38 45 45 58 34 44 At the 1% significance level, do the data provide sufficient evidence to conclude that, on average, cold water is less effective than ice slurry for optimizing athletic performance in the heat? (Note: the mean and standard deviation of the paired differences are – 5.9 and 1.60 minutes, respectively.)
Cooling down with a cold drink before exercise in the heat is believed to help an athlete perform. Researcher J. Dugas explored the difference between cooling down with an ice slurry (slushy) and with cold water. Ten male participants drank a flavored ice slurry and ran a treadmill in a controlled hot and humid environment. Days later, the same participants drank cold water and ran on a treadmill in the same hot and humid environment. The following table shows the times, in minutes, it took to fatigue on the treadmill for both the ice slurry and the cold water.
Subject Cold Water
-
1 52
-
2 37
-
3 44
-
4 51
-
5 34
-
6 38
-
7 41
-
8 50
-
9 29
10. 38
Ice Slurry 56 43 52 58 38 45 45 58 34 44
At the 1% significance level, do the data provide sufficient evidence to conclude that, on average, cold water is less effective than ice slurry for optimizing athletic performance in the heat? (Note: the mean and standard deviation of the paired differences are – 5.9 and 1.60 minutes, respectively.)
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