Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-In a sample of 10 randomly selected employees, it was found that their mean height was $63.4$ inches. From previous studies, it is assumed that the standard deviation, $\sigma$ , is $2.4$ . Compute the $95 \%$ confidence interval for $\mu .$

A) $( 61.9,64.9 )$
B) $( 58.1,67.3 )$
C) $( 59.7,66.5 )$
D) $( 60.8,65.4 )$