Researchers usually test the hypothesis 
with an alternativehypothesis of 
0rather than using a one-sided alternative.
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Q9: The estimated standard deviation of 
Q10: In many animal species the males and
Q12: "Tail-chasing" by dogs is an anxiety disorder
Q13: "Tail-chasing" by dogs is an anxiety disorder
Q15: The Amazon River basin includes the largest
Q16: Generally speaking, the "pooled" t is preferred
Q17: When an alternative hypothesis is
Q18: Two samples are said to be independent
Q18: For both large and small samples the
Q19: For paired samples
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