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 The population standard deviations are unknown The samples are randomly selected and independent. The populations are normally distributed or each O B. The population standard deviations are unknown. The populations are normally distributed or each sample size is at least 30 O C. The population standard deviations are known. The samples are randomly selected and independent. The populations are normally distributed or each sample 0 D. The population standard deviations are unknown. The samples are randomly selected and idependent. sample size is at least 30 size is at least 30.

Explanation / Answer

A necessary condition to use a t-test to test the differences between two population means is that the samples are randomly selected and independent. Also, the populations must be normally distributed or with size atleast 30. The populatiion standard deviation is unknown.

The correct answer is A.

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