A Random Sample of Size 30 from a Normal Population $\bar { X }$

question 142

Multiple Choice

A random sample of size 30 from a normal population yields $\bar { X }$
= 32.8 with a population standard deviation of 4.51.Construct a 95 percent confidence interval for ?.

• A) \(\left[ \begin{array} { l l }
• 23.96 & 41.64
• \end{array} \right]\)
• B) \([ 32.04\)\( \quad\)\( \quad\)\(33.56 ]\)
• C) \([ 31.45 \quad 34.15 ]\)
• D) \(\left[ \begin{array} { l l }
• 31.19 & 34.41
• \end{array} \right]\)

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