Question

# The Columbus Dispatch conducted a study. Two identical football, one filled with helium and one filled...

The Columbus Dispatch conducted a study. Two identical football, one filled with helium and one filled with ordinary air, were used. A casual observer was unable to detect a difference in the two footballs. A novice kicker was used to punt the footballs. A trial consisted of kicking both footballs in a random order. The kicker did not know which football he was kicking. The distance of each punt was recorded, then another trial was conducted. A total of 39 trials were run. Do the data indicate that helium-filled footballs travel farther than air-filled footballs? Give a confidence interval and significance test. (Data: FTBALL)

 Helium Air Difference 25 25 0 16 23 -7 25 18 7 14 16 -2 23 35 -12 29 15 14 25 26 -1 26 24 2 22 24 -2 26 28 -2 12 25 -13 28 19 9 28 27 1 31 25 6 22 34 -12 29 26 3 23 20 3 26 22 4 35 33 2 24 29 -5 31 31 0 34 27 7 39 22 17 32 29 3 14 28 -14 28 29 -1 30 22 8 27 31 -4 33 25 8 11 20 -9 26 27 -1 32 26 6 30 28 2 29 32 -3 30 28 2 29 25 4 29 31 -2 30 28 2 26 28 -2

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