Please help me and explain!
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Answer:
b. The difference was not practically significant.
Step-by-step explanation:
Let mu1 be the mean GPA of freshmen who lived on campus
And mu2 be the mean GPA of freshmen who commuted
: mu1-mu2=0
: mu1-mu2>0
Since p-value of test statistic<0.05, the result is statistically significant
But the offer to make all freshmen live on campus is rejected likely due to it is being not practically significant.
Although the result is statistically significant, the effect size of the action (making all freshmen live on campus and moving their GPA's from 2.51 to 2.53) would not be worth to make the decision.
Thus the result is not practically significant.