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A random sample of size n has been selected from a normally distributed population whose standard...

A random sample of size n has been selected from a normally distributed population whose standard deviation is σ. In hypothesis testing for the population mean, the t-test should be used instead of the z-test if: A. n>30 and σ is unknown B. n<30 and σ is known C. both A and B are true D. both A and B are false

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TOPIC:Conditions for the one sample t-test for the population mean.

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