Question

One sample has a mean of M=6, and a second sample has a mean of m=12. The two samples are combined into a si gel set of scores. What is the mean for the combine set if both of the original samples have n=4 scores?

Answer 1

The mean for the combined set is 9.

Explanation:

The mean is the sum of all scores divided by the number of scores.

First sample: Four scores, mean of 6. So they combine to 4*6 = 24.

Second sample: Four scores, mean of 12. So they combine to 4*12 = 48.

Combined set:

Eight scores.

Their sum is 24+48 = 72.

72/8 = 9

The mean for the combined set is 9.