19. One sample has a mean of M 4 and a second sample has a mean of...

Question:

19. One sample has a mean of M 4 and a second sample has a mean of M 8. The two samples are combined into a single set of scores.

a. What is the mean for the combined set if both of the original samples have n 7 scores?

b. What is the mean for the combined set if the first sample has n 3 and the second sample has n 7?

c. What is the mean for the combined set if the first sample has n 7 and the second sample has n 3?

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