Instruction 18-3
A political pollster randomly selects a sample of 100 voters each day for eight successive days and asks how many will vote for the incumbent. The pollster wishes to construct a p chart to see if the percentage favouring the incumbent candidate is too erratic.
$$\begin{array} { | c | c | }
\hline \begin{array} { c }
\text { Sample } \
\text { (Day) }
\end{array} & \begin{array} { c }
\text { Number Favouring } \
\text { Incumbent Candidate }
\end{array} \
\hline 1 & 57 \
\hline 2 & 57 \
\hline 3 & 53 \
\hline 4 & 51 \
\hline 5 & 55 \
\hline 6 & 60 \
\hline 7 & 56 \
\hline 8 & 59 \
\hline
\end{array}$$
-Referring to Instruction 18-3,which expression best characterises the p chart?
A) Individual outliers
B) In control
C) Decreasing trend
D) Increasing trend

Question

Instruction 18-3
A political pollster randomly selects a sample of 100 voters each day for eight successive days and asks how many will vote for the incumbent. The pollster wishes to construct a p chart to see if the percentage favouring the incumbent candidate is too erratic.
 $$\begin{array} { | c | c | } 
\hline \begin{array} { c } 
\text { Sample } \
\text { (Day) }
\end{array} & \begin{array} { c } 
\text { Number Favouring } \
\text { Incumbent Candidate }
\end{array} \
\hline 1 & 57 \
\hline 2 & 57 \
\hline 3 & 53 \
\hline 4 & 51 \
\hline 5 & 55 \
\hline 6 & 60 \
\hline 7 & 56 \
\hline 8 & 59 \
\hline
\end{array}$$
-Referring to Instruction 18-3,which expression best characterises the p chart?
A) Individual outliers
B) In control
C) Decreasing trend
D) Increasing trend

Quizplus · Accepted Answer

A p chart is used to monitor the proportion of nonconforming items in a sample over time. In this case, the pollster is using it to see if the percentage of voters favouring the incumbent is too erratic. The chart is deemed to be "in control" if the data points fall within the control limits and show no patterns or trends over time. While there may be individual outliers, they do not necessarily affect the overall conclusion about whether the process is in control. There is no evidence of a decreasing or increasing trend mentioned in the question.

Instruction 18-3 a Political Pollster Randomly Selects a Sample of 100

Instruction 18-3
a Political Pollster Randomly Selects a Sample of 100