1. Which of the following is a fundamental difference between the t statistic and a z-score? The t statistic uses the sample mean in place of а. the population mean. The t statistic uses the sample variance in place b. of the population variance. The t statistic computes the standard error by c. dividing the standard deviation by n - 1 instead of dividing by n. d. All of these are differences between t and z.

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