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6. [prɪ'kɜːsə]先驱、前体______

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一、WordsDirections： Write words according to phonetic symbols1. ['blɛfərə,plæsti] 眼睑成形术______

20. Step 6~8:Conclusion: t=.45, p____0.05

A. >

19. Critical value is

A. 1.729
B. 1.829
C. 1.629
D. 1.929

二、计算题18-20为同一大题18. For the following information, computer the t value manually and write a conclusion as to whether there was a change in tons of paper used as a function of the recycling program in 20 different districts.Step 1: H0: before=afterH1: before

A. 17
B. 18
C. 19
D. 20