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33) What we really want to know is whether coached students improve more than uncoached students,...

33) What we really want to know is whether coached students improve more than uncoached students, and whether any advantage is large enough to be worth paying for.

Try 1 Try 2 Gain
n x s x s x s

Coached 427 500 92 529 97 29 59
Uncoached 2733 506 101 527 101 21 52

(a) Is there good evidence that coached students gained more on the average than uncoached students?

(b) How much more do coached students gain on the average? Give a 99% confidence interval.

(c) Based on your work, what is your opinion: do you think coaching courses are worth paying for?

math   Statistics-And-Probability   
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