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.
Day Number favoring incumbent candidate
1 57
2 57
3 53
4 51
5 55
6 60
7 56
8 59
a. Referring to the problem statement, what is the numerical value of the center line for the p chart?
b. Referring to the problem statement, what is the numerical value of the lower control limit for the p chart?
c. Referring to the problem statement, what is the numerical value of the upper control limit for the p chart?