To find critical value, when do you use t-table instead of z? Question 1 options

Question

To find critical value, when do you use t-table instead of z?

Question 1 options:

When population mean is unknown but sample mean is known

None of the given answers are correct.

When sample mean is unknown but population mean is known

When population variance is unknown but sample variance is known

When population standard deviation is known but sample standard deviation is unknown.

When population mean is unknown but sample mean is known

None of the given answers are correct.

When sample mean is unknown but population mean is known

When population variance is unknown but sample variance is known

When population standard deviation is known but sample standard deviation is unknown.

Explanation / Answer

Option-D) When population variance is unknown but sample variance is known                                                                                                                                                                                                                                                                           

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