Two Independent Samples of Sizes 40 and 50 Are Randomly

question 39

Multiple Choice

Two independent samples of sizes 40 and 50 are randomly selected from two populations to test the difference between the population means . Which of the following best describes the sampling distribution of the sample mean difference ?

• A) It is normally distributed.
• B) It is approximately normal.
• C) It is student t-distributed with 88 degrees of freedom.
• D) It is student t-distributed with 90 degrees of freedom.

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