A study compared number of soccer players who experienced a hamstring injury during the season between two groups of players: players who did typical training (Normal) and players who performed additional eccentric training (Extra Eccentric). Use the final exam training dataset to answer the questions below.

https://jasp-stats.org/

https://docs.google.com/spreadsheets/d/1zyXAL-d1AhnzyZ57h0ZycpKJ9IlI8y21OqaiNf02L1k/edit?usp=sharing

a. Was there a significant difference in the number of hamstring injuries between the two training groups (2 point)? What evidence do you have to support your conclusion (1 point)

b. Why is there one degree of freedom in this analysis (1 point)? Support your answer using math.

c. For eccentric training, calculate the number needed to treat (NNT) (2 points).