Chapter 8 Bare Bones Slides

Chapter 8 Bare Bones Slides - Chapter 8 Part I Sampling...

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Chapter 8 1 Chapter 8 Part I Sampling Distributions and Estimation

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Chapter 8 2 Acceptance Sampling Example A small business currently performs acceptance sampling on all shipments of blank CDs they receive to verify that the diameter of the CD is on target. The target value for CD diameter is 12 cm. They take a SRS of 100 CDs from each shipment. If the sample average is within the range (11.996, 12.004) the business will accept the shipment. Suppose on Friday they received a shipment of 10,000 blank CDs from their supplier. Unknown to the small business, the shipment had an average diameter of 12.003 cm. The sample of 100 CDs had an average diameter of 12.005 cm.
Chapter 8 3 Identify the parameters and statistics from this problem. Based on the information given, should the inspector keep the shipment or send it back?

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Chapter 8 4 Assuming the inspector rejected the shipment of CDs, did the inspector make the correct decision?
Chapter 8 5 Histogram of 100 CD Diameters 0 5 10 15 20 25 30 11.95 11.96 11.97 11.98 11.99 12 12.01 12.02 12.03 12.04 12.05 12.06 Maximum CD Diameter Frequency

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Chapter 8 6 Sampling Variability Sample statistics will vary from sample to sample. Population parameters remain fixed as long as the population remains the same. Process parameters remain fixed as long as the process remains the same. Sometimes we know a parameter value and sometimes we don’t.
Chapter 8 7 The value of a statistic can change whenever we take a new random sample.

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