Are Japanese managers more motivated than American managers? A randomly selected group of each were administered the

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Question:

Are Japanese managers more motivated than American managers? A randomly selected group of each were administered the Sarnoff Survey of Attitudes Toward Life (SSATL), which measures motivation for upward mobility.

Judging from the way the data were collected, which test would likely be most appropriate to employ?

A. Paired t Test B. Pooled-variance t test for the difference between two means C. Independent samples Z test for the difference between two means D. Related samples Z test for the mean difference.