SCENARIO 19-2
A political pollster randomly selects a sample of 100 voters each day for 8 successive days and asks how many will vote for the incumbent.The pollster wishes to construct a p chart to see if the percentage favoring the incumbent candidate is too erratic.

-Referring to Scenario 19-2,which expression best characterizes the p chart?
A)In-control
B)Increasing trend
C)Decreasing trend
D)Individual outliers

Question

SCENARIO 19-2
A political pollster randomly selects a sample of 100 voters each day for 8 successive days and asks how many will vote for the incumbent.The pollster wishes to construct a p chart to see if the percentage favoring the incumbent candidate is too erratic.
 
-Referring to Scenario 19-2,which expression best characterizes the p chart?
A)In-control 
B)Increasing trend 
C)Decreasing trend 
D)Individual outliers

Quizplus · Accepted Answer

The p chart is used to monitor the proportion of a certain outcome (in this case, the percentage of voters favoring the incumbent) over time. The fact that the pollster is randomly selecting samples and using them to construct the chart suggests that the process is in control and not exhibiting any significant trends or outliers. Therefore, the best choice is A, in-control.

SCENARIO 19-2 A Political Pollster Randomly Selects a Sample of 100 Voters