A Random Sample Is Selected from a Normally Distributed Population

question 208

Multiple Choice

A random sample is selected from a normally distributed population. The following sample statistics are obtained: n = 20, = 30, and s = 10. Based on this information, and using a 95% confidence level, which of the following statements is true?

• A) The critical value is 1.7921.
• B) The standard deviation of the sampling distribution ofis .50.
• C) The margin of error is approximately4.68.
• D) The critical value is 1.96.
• E) The margin of error is approximately3.24.

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