For the hypothesis, H0: µ1 ≤ µ2, a random sample of 10 observations is selected from the first normal population and 8 from the second normal population. What is the number of degrees of freedom?
A.
18
B.
17
C.
16
D.
9
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【单选题】Scientists generally hold that language has been so long in use that the length of time writing is known to cover is ______ in Comparison.