Question

4. On a calm day on the e campus of The Ohio State University, a kicker alternated between ootball and an air-filled football. Each ball was kicked 39 times. It is possible ncrease the distance of the kicks with practice or decrease the distance of that the kicker would either i the kicks due to To atigue. To avoid any bias of this nature, the balls were kicked in pairs, alternating e heum-filled and air-filled balls with each kick. The difference in the distance the two eked in each of the 39 trials was recorded. After deleting the unsuccessful kicks where the id not travel very far forward, the researchers determined that the sample test statistic was balls were ki に1.555 http:/lib.stat.cmu.edu/DASL/Stories/Heliumfootball.html) a. Why are these matched-pairs data? and the P-value for a two-sided hypothesis test was 0.0646. (Souree: b. Is there a difference in the mean distance traveled by the helium- and air filled footballs at the a -0.0s level of significance?

Answer 1