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【单选题】
A researcher wants to conduct a before/after study on 11 subjects to determine if a treatment results in any difference in scores. The null hypothesis is that the average difference is zero while the alternative hypothesis is that the average difference is not zero. Scores are obtained on the subjects both before and after the treatment. After subtracting the after scores from the before scores, the average difference is calculated to be –2.40 with a sample standard deviation of 1.21. Assume that the differences are normally distributed in the population. The degrees of freedom for this test are _______.A.
11
B.
10
C.
9
D.
20
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举一反三
【单选题】If you have good computer skills and are looking for a job, you may______.
A.
contact the University of Cumberland
B.
call the company at 457 - 896754
C.
apply at Tommy's Kindergarten
D.
visit the United Business Ltd
【单选题】To have your travel notes published, you may contact.
A.
Students’ Union
B.
Gayle Moore
C.
The International Center
D.
Life Planning Workshop
【单选题】You may get the contact information for canceling ticket through _________________.
A.
call the airline for information or log onto the airlines website
B.
ask your boss
C.
read the newspaper
【单选题】If you have good computer skills and are looking for a job, you may ______.
A.
contact the University of Cumberland
B.
visit the United Business Ltd.
C.
apply at Tommy's Kindergarten
D.
call the company at 457-896754
【判断题】When explaining a visual aid, you should keep eye contact with your listeners, while you may glance at the aid periodically as you talk.
A.
正确
B.
错误
【单选题】You may contact the Bank of China, Beijing Branch, for any information concerning our credit _______.
A.
stand
B.
standing
C.
understand
D.
understanding
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