Samples A and B were selected from the same population. The mean of sample A is equal to the mean of the population. Which of the following statements must be true? A) The mean of sample A is a point estimator for the mean of the population. B) The mean of sample B is a point estimator for the mean of the population.
C) The mean of sample A is equal to the mean of sample B.

Choose the description that best matches each word. write the correct letter in the blank. 1. ostinato a. large, extended composition for chorus and orchestra 2. atonality b. full orchestra 3. musicology c. festive, march-like opening to a play or “semi-opera” 4. concerto d. small group of solo instruments 5. minimalism e. music contrasting a full orchestra and solo instruments 6. art song f. music played under the action to influence the mood 7. strophic form g. a vocal song focusing on artistic expression 8. incidental h. each stanza of a poem is set to the same music 9. oratorio i. repeated musical pattern that provides unity to a piece 10. dissonance j. steady beat; simple harmonies; short, repetitive melody 11. concertino k. harsh, unstable sounding of pitches; harmonic tension 12. tutti l. all 12 tones of chromatic scale, no tonal center 13. entrada m. the historical and scientific study of music

Only people in ap world history can can someone give me a question and a statement to present to the class about chapter 15,16,or17

What drifted apart millions of years ago to create two different worlds