In what circumstances is the t statistic used instead of a z-score for a hypothesis test? a.

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In what circumstances is the t statistic used instead of a z-score for a hypothesis test?

a. The t statistic is used when the sample size is n 5 30 or larger.

b. The t statistic is used when the population mean is unknown.

c. The t statistic is used when the population variance (or standard deviation)

is unknown.

d. The t statistic is used if you are not sure that the population distribution is normal.

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