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Margin of error use t-value from appendix table

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Quality control in manufacturing plan randomly selected sample of n=9 ready for shipment items and checked parameters. Sample average was found as ?x =40 with a sample standard deviation of s=12. Construct a 90% confidence interval for the population mean. This is the case when population standard deviation is unknown. For Margin of Error use t-value from Appendix Table for t-Distribution.

Reference no: EM131954180

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