In testing the hypotheses, 
The two population locations are the same, and 
The location of population 1 is to the left of the location of population 2, the statistics 
, 
, 
, and 
are calculated with data drawn from two independent samples.
a. Which test is used for testing the hypotheses above?
b. What is the value of the test statistic?
c. What is the rejection region for this test at 
= 0.05?
d. What is your conclusion at 
= 0.05?
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