mean rate is $10/hr, stand. dev. of 2; sample of 20 is $12/h



Hello Messanger:

Please give us a clue as to what you already know about these types of exercises. Show any work and reasoning that you've able to accomplish, so far.

If you already understand what the exercise is asking, then are you able to say something about why you're stuck?

(Also, PLEASE read the post titled, "Read Before Posting", if you have not already done so.)

Cheers,

~ Mark :)

 
With correct conditions, we can use the small sample test for means here. n = 20, x-bar = 12, mean = 10, s = 2. T = (x-bar - mean) / (s/sqrt(n)) is our test statistic, and T_.05 is our critical value obtained via statistical tables. we are testing H0: x-bar <= mean vs. Ha: x-bar > mean. Compare T with T_.05 to make a decision about whether NJ training is effectively raising wages.


Am i on the right track?
 
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