SOLUTION: Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or cutoffs) on the comparison

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Question 460651: Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
Study / µ / σ / Sample Score / p / Tails of Test
A / 100.0 / 10.0 / 80 / .05 / 1 (low predicted)
B / 100.0 / 20.0 / 80 / .01 / 2
C / 74.3 / 11.8 / 80 / .01 / 2
D / 16.9 / 1.2 / 80 / .05 / 1 (low predicted)
E / 88.1 / 12.7 / 80 / .05 / 2
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
A)/ 100.0 / 10.0 / 80 / .05 / 1 (low predicted)
-1.645 z-score cutoff
z=(80-100)/10=-2
reject the null hypothesis.
.
Ed