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Is there sufficient evidence to conclude that there is a mean difference in mile time for...

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Question

Basic Math

Is there sufficient evidence to conclude that there is a meandifference in mile time for runners when they had coffee withbreakfast vs without?

PAIRED SAMPLES TEST
Pair 1 coffee-nocoffee
Mean=-.31585
Std. Deviation= .52660
Std. Error mean=.08326
Lower=-.48427
Upper= -.14744
t= -3.793
df=39
Sig. (2-tailed)=.001

a. Should they reject or retain? Give numericaljustification
b. Calculate the effect size
c. Interpret the effect size in the context of thesituation

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