Consider the Following to Answer the Question(s) Below

question 11

Multiple Choice

Consider the following to answer the question(s) below:
In a metal fabrication process, metal rods are produced that have an average length of 20.5 metres with a standard deviation of 2.3 metres. A quality control specialist collects a random sample of 30 rods and measures their lengths.
-Which of the following statements is (are) true about the sampling distribution of the sample mean?

• A) The sampling distribution follows the Normal model with a mean of 0.68 and a standard deviation of 2.3.
• B) The sampling distribution follows the Normal model with a mean of 20.5 and a standard deviation of 0.42.
• C) The sampling distribution follows the Normal model with a mean of 0.68 and a standard deviation of 0.077.
• D) The sampling distribution follows the Normal model with a mean of 3.74 and a standard deviation of 2.3.
• E) The sampling distribution follows the Normal model with a mean of 3.74 and a standard deviation of 0.077.

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