What conditions are necessary in order to use a t-test to test the differences b

Question

What conditions are necessary in order to use a t-test to test the differences between two population means? Choose the correct answer below. A. O B. ° C. The population standard deviations are unknown. The samples are randomly selected and independent. The populations are normally distributed or each sample size is at least 30. The population standard deviations are unknown. The populations are normally distributed or each sample size is at least 30. The population standard deviations are unknown. The samples are randomly selected and independent. O D. The population standard deviations are known. The samples are randomly selected and independent. The populations are normally distributed or each sample size is at least 30.

Explanation / Answer

The correct answer is C. the standard deviation should be unknown and the samples must be independent and randomly selected.

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