A researcher measures the mean time (in seconds) it takes two groups of children to complete an activity task. She finds that Group A (M = 22 s) completed the task more quickly than Group B (M = 36 s). She then computes a weighted mean for both groups combined and calculates a weighted mean equal to 26. Based on the information provided, which group had a larger sample size?
A. Group A.
B. Group B.
C. The sample size is equal in both groups.
D. It is not possible to know this without knowing the sample size for each group.
Ans: A
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