A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: $$\begin{array} {r }
{ \text { Measurements } } \
\begin{array} { l l l l l }
\text { Machine } & \
\hline \# 1 & 17 & 15 & 15 & 17 \
\# 2 & 16 & 25 & 18 & 25 \
\# 3 & 23 & 24 & 23 & 22
\end{array}\end{array}$$ What is the sample mean for machine #1?
A) 15
B) 16
C) 17
D) 21
E) 23

Question

A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: $$\begin{array} {r } 
{ \text { Measurements } } \
\begin{array} { l l l l l } 
\text { Machine } &   \
\hline   \# 1 & 17 & 15 & 15 & 17 \
\# 2 & 16 & 25 & 18 & 25 \
\# 3 & 23 & 24 & 23 & 22
\end{array}\end{array}$$ What is the sample mean for machine #1?
A) 15
B) 16
C) 17
D) 21
E) 23

Quizplus · Accepted Answer

The sample mean for machine #1 is calculated by adding the measurements (17, 15, 15, 17) and dividing by the number of measurements (4), which equals 16.

A Quality Analyst Wants to Construct a Control Chart for Determining