Please use Excel for this, this excel sample image is here.

S6.21 Peter Ittig's department store, Ittig Brothers, is Amherst's largest independent clothier. The store receives an average of six returns per day. Using Z = 3, would 9 returns in a day warrant action? PX c chart Enter the number of defects for each of the samples/items. 9 Results 9 3 54 0 Total units sampled Total Defects Defect rate, a Standard deviation z value 6 8 2.44948974 3 9 6 7 13.3484692 4 Upper Control Limit Center Line Lower Control Limit 6 1 CHAPTER S6: Example S5 2 3 Quality Control 4 5 Number of samples 6 7 8 Data 9 # Defects 10 Sample 1 11 Sample 2 12 Sample 3 13 Sample 4 14 Sample 5 15 Sample 6 16 Sample 7 17 Sample 8 18 Sample 9 19 20 21 22 23 Graph information 24 Sample 1 25 Sample 2 26 Sample 3 27 Sample 4 28 Sample 5 29 Sample 6 30 Sample 7 31 Sample 8 32 Sample 9 33 34 9 O 8 C-chart 15 10 Mean 3 5 6 13.3484692 6 13.3484692 6 13.3484692 6 13.3484692 .||| 0 0 8 1 2 3 4 5 6 7 8 9 9 Sample 6 O O O O O O O O O 7 6 13.3484692 6 13.3484692 6 13.3484692 4 9 6 13.3484692 8 6 13.3484692