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1. The average time to run a race is 14 minutes. You wish to see if...

1. The average time to run a race is 14 minutes. You wish to see if a new training regimen will lower the time to run the race. After doing the training regimen you run the race 35 times and the average time to run the race now is 13.32 minutes with a standard deviation of 1.4 minutes.

E) How do you explain the .68 minutes lowering of the time

math   Statistics-And-Probability   
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