Question 974410
14.	Based on the information given for the following studies, decide whether to reject the null hypothesis. Assume that all populations are normally distributed. 
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.
c.	Your conclusion. 
Study	µ	σSampleScore	p	Tails of Tests
A	5	1	7	0.05	1 (high predicted)
Cutoff:: z = 1.645
test statistic of the sample score:: (7-5)/1 = 2
Conclusion:: Since the test stat is in the reject interval, reject Ho.
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B	5	1	7	0.05	2
Cutoffs:: z = +/-1.96
test stat:: (7-5)/1 = 2
Conclusion:: Since the test stat is in the reject interval, reject Ho.
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C	5	1	7	0.01	1 (High predicted)
Cutoff:: z = 2.3264
test stat:: 2
Conclusion:: Since the test stat is not in the reject interval, do not reject Ho
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D	5	1	7	0.01	2
Cutoffs:: z = 2.5758
test stat:: 2
Conclusion:: Not in reject interval; do not reject Ho.
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Cheers,
Stan H.
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