Question: What is the difference between a z-test and a one-sample t-test? O A one-sample t-test is used when mu is unknown. O A one-sample t-test

What is the difference between a z-test and a one-sample t-test? O A one-sample t-test is used when mu is unknown. O A one-sample t-test is used when sigma is unknown. O They can be used interchangeably. O A one-sample t-test is used when sigma is known

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