When Two Independent Random Samples of Sizes and

question 164

Multiple Choice

When two independent random samples of sizes and have been selected from populations with means and and variances and , respectively, which of the following is a property of the sampling distribution of ?

• A) If the sampled populations are normally distributed, then the sampling distribution ofis exactly normal only whenandare both 30 or more.
• B) If the sampled populations are normally distributed, then the sampling distribution ofis exactly normal regardless of the sizes ofand.
• C) If the sampled populations are not normally distributed, then the sampling distribution ofis approximately normally distributed regardless of the sizes ofand.
• D) If the sampled populations are not normally distributed, then the sampling distribution ofis approximately normally distributed only ifis 30 or more.

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