In a study of 265 subjects,the average score on the examination was 63.8 and s = 3.08.What is a 95 percent confidence for ??
A) $\left[ \begin{array} { l l }
63.59 & 64.01
\end{array} \right]$
B) $\left[ \begin{array} { l l }
57.76 & 69.84
\end{array} \right]$
C) $\left[ \begin{array} { l l }
63.43 & 64.17
\end{array} \right]$
D) $\left[ \begin{array} { l l }
63.56 & 64.04
\end{array} \right]$

Question

In a study of 265 subjects,the average score on the examination was 63.8 and s = 3.08.What is a 95 percent confidence for ??
A) $\left[ \begin{array} { l l } 
63.59 & 64.01
\end{array} \right]$
B) $\left[ \begin{array} { l l } 
57.76 & 69.84
\end{array} \right]$
C) $\left[ \begin{array} { l l } 
63.43 & 64.17
\end{array} \right]$
D) $\left[ \begin{array} { l l } 
63.56 & 64.04
\end{array} \right]$

Quizplus · Accepted Answer

The 95% confidence interval is calculated using the formula: mean ± (Z * (s/√n)). With a mean of 63.8, s = 3.08, n = 265, and Z ≈ 1.96 for 95% confidence, the interval is approximately [63.43, 64.17].

In a Study of 265 Subjects,the Average Score on the Examination