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 see if the percentage favoring the incumbent candidate is too erratic.Which of the following would be the most appropriate analysis to perform?
A)Multiple linear regression.
B)Exponential smoothing.
C)Construct a p-chart.
D)Perform a Levene's test.

Question

Quizplus · Accepted Answer

To analyze the stability and variability of the percentage favoring the incumbent candidate over time, constructing a p-chart is the most appropriate option. A p-chart is a control chart used to monitor the proportion of defects or nonconforming items in a sample. In this case, the proportion of voters who favor the incumbent candidate is the measure of interest. A p-chart will allow the pollster to determine if the percentage favoring the incumbent candidate is within the acceptable range of variability or if it is too erratic. Multiple linear regression and exponential smoothing are not appropriate for this type of data, and Levene's test is used to test for equality of variances in two or more groups, which is not applicable in this scenario.

A Political Pollster Randomly Selects a Sample of 100 Voters