population std deviation=12

Normal Distribution

n=16

alpha level=.05

* compute the power of the hypothesis test if the program has a 3-point effect.

I came up with 83.88 %

[ i got this by mulitiping the z-core of 1.96+(78)*2

then i found the propotion which was .08388*10=83.88%

* compute the power of the hypothesis test if the program has a 6-point effect.

I looked at the example in the book and I'm just not understanding! Help. Thanks.