Nhà trường muốn đánh giá số giờ tự học của sinh viên. Điều tra 200 sinh viên nhận thấy số giờ tự học trung bình mẫu của một sinh viên là 5,58 h/tuần và độ lệch chuẩn mẫu là 2,3467 h/tuần. Có ý kiến cho rằng số giờ tự học trung bình của sinh viên là 6h/tuần. Với mức ý nghĩa 5% hãy tính giá trị kiểm định và cho nhận xét về ý kiến trên.

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  I always feel safe and _________ in my family.

• Read the following passage and choose the best answer for each blank:

           I come from a family that values education. My grandma, born on the early side of the 1900 line, had four college (1)______, quite unusual for a woman of that era. My dad still tells the story about her trying to (2)________ visitors by displaying all four diplomas (Yale, Syracuse, Oberlin and Columbia) and then adding a tiny little certificate she got for completing a 6-week training course with the telephone company (3)_____ World War I.

          My mom's side of the family did not have extensive educational backgrounds (4)_____, but most dedicated their working lives (5)______teaching children.

          I do not have a large (6)_______ family, but most of them are teachers. My dad, the black sheep of the family, was only (7)_______ to speak at family reunions once he left the unseemly world of banking to become a corporate trainer.

          So since my family values education (not in the snobby way, (8)________ in a way that ingrained the significance of learning in me from an early age), it was somewhat natural for me to gravitate in the same direction. (9)________ , during the early days of personal computers, while getting a B.S. in business, I was bitten by the technology bug (10)_______ left a permanent welt that drives me to this day.

  1. A. certificates	B. degrees	C. bachelors	D. licenses
  2. A. pride	B. amuse	C. impress	D. annoy
  3. A. in	B. at	C. on	D. during
  4. A. themselves	B. ourselves	C. herself	D. itself
  5. A. for	B. with	C. to	D. about
  6. A. extend	B. extensive	C. extending	D. extended
  7. A. allowed	B. let	C. recommended	D. suggested
  8. A. so	B. but	C. and	D. so that
  9. A. Therefore	B. Moreover	C. However	D. Still
  10. A. who	B. when	C. where	D. which

   

• Choose the best answer for the following sentence:

  They sell all kinds of rubbish now, but ________.

• Choose the best answer for the following sentence:

  Yesterday evening while we were playing cards, _________ .
  
  

• Choose the best answer for the following sentence:

  It's the most delicious meal _________.
  
  

• Find a mistake in the four underlined parts of the sentence and correct it:

  I was feeling rather sad as I was waving goodbye to my friends. 

        

   

• Find a mistake in the four underlined parts of the sentence and correct it:

  I didn’t see Mary since she went to live in the capital. 

                                      

• Find a mistake in the four underlined parts of the sentence and correct it:

  While I waited for the bus, I noticed an old man lying on the ground.

                                                                                 

• Find a mistake in the four underlined parts of the sentence and correct it:

  I always talk to my parents before make an important decision.

                                                                                  

• Choose one sentence that has the same meaning as the root one:

  I haven’t been to Ho Chi Minh City since 2005.