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We are interested in studying the difference in mile running times for beginners 30 days into...

We are interested in studying the difference in mile running times for beginners 30 days into training and then 90 days into training to see if they have made significant improvements. The following data is provided: Runner 30 days 90 days 1 10.2 9.8 2 9.7 8.75 3 8.9 8.0 4 11.6 10.9 5 12.9 12.2 The test statistic is:

a. t=0.2168

b. z=7.5292

c. t= -7.5292

d. t= 7.5292

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