Develop a p-chart for ninety five percent confidence

Question

Problem:

Ten samples of 15 parts each were taken from an ongoing process to establish a p-chart    for control. The samples and the number of defectives in each are shown in the following table:                          

                                  Number of                                              Number of
                                Defective Items                                       Defective Items
Sample       n              in the Sample         Sample         n              in the Sample
                   
     1         15                    3                      6            15                 2
     2         15                    1                      7            15                 0
     3         15                    0                      8            15                 3
     4         15                    0                      9            15                 1
     5         15                    0                     10           15                 0
                   
Required:

Question 1) Develop a p-chart for 95 percent confi dence (1.96 standard deviation).

Question 2) Based on the plotted data points, what comments can you make?

Solve the given numerical problem and illustrate step by step calculation.