With a 90% level of confidence, a company producing street signs wants to be sure the length of their product is meeting quality standards. The error allowed is 0.5 cm and the production manager knows the standard deviation to be 3 cm. How many signs does he need to sample?
Can you show me step by step how it works? I don't know how it works at all. Please help me out! Thankx (Show me which equation you used and please explain why you used it)
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