Welcome to Westonci.ca, where curiosity meets expertise. Ask any question and receive fast, accurate answers from our knowledgeable community. Join our platform to get reliable answers to your questions from a knowledgeable community of experts. Get precise and detailed answers to your questions from a knowledgeable community of experts on our Q&A platform.

Which of the following statements is true about control charts?
A. The data must be normally distributed to use them correctly.
B. Only 7 to 10 samples are needed to get a good initial estimate of common cause.
C. The process must be brought into control to use them effectively.
D. The individuals chart (I-chart) is invalid for data using "counts" (tallies).