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2 answers:
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Answer:
Null hypothesis:
Alternative hypothesis:
And for this case we assume that we have equal variances so that means:
For this case the degrees of freedom are given by:
And replacing we got:
And the best answer would be:
a. 38
Step-by-step explanation:
For this problem we want to test the following:
Null hypothesis:
Alternative hypothesis:
And for this case we assume that we have equal variances so that means:
For this case the degrees of freedom are given by:
And replacing we got:
And the best answer would be:
a. 38