A Sample of 12 Items Yields $\bar { X }$ = 485 Grams and S = 1

question 77

Multiple Choice

A sample of 12 items yields $\bar { X }$
= 48.5 grams and s = 1.5 grams.Assuming a normal distribution,construct a 90 percent confidence interval for the population mean weight.

• A) \(\left[ \begin{array} { l l }
• 47.722 & 49.278
• \end{array} \right]\)
• B) \([ 47.788\)\( \quad\)\( \quad\)\(49.212 ]\)
• C) \(\left[ \begin{array} { l l }
• 45.806 & 51.194
• \end{array} \right]\)
• D) \([ 47.865\)\( \quad\)\( \quad\)\(49.135 ]\)

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