According to records at the guidance office, the mean GPA of all juniors is 3.45 and the mean GPA of all seniors is 3.62. Which of the following statements is true?

A parameter describes a numerical characteristic of an entire population, while a statistic describes a sample. The guidance-office records give the mean GPA for all juniors and all seniors, so 3.45 and 3.62 are both parameters. Therefore, choice D is correct.

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