1. Draw a scatter diagram for the following data where it is suggested that df (defective fraction)is a function of temperature T. Note the following definition of T.
Sample No. T df
1 120 80
2 110 75
3 105 65
4 112 73
5 118 78
T is the temperature of the plating tank and df is the measure of defective parts per thousand, after plating. Does there seem to be a special relationship (correlation) between T and df? Using the the QMpom module called Forecasting Models (Linear Regression)will facilitate solving problem 1. Include the correlation coefficient in the discussion.
2. After setup in the job shop, the first items made are likely to be defectives. If the order size calls for 125 units, and the expected percent defective for start-up is 7 percent, how many units should be made?
3. A subassembly of electronic components, called M1, consists of 5 parts that can fail. Three parts have failure probabilities of 0.03. The other two parts have failure probabilities of 0.02. Each M1 can only be tested after assembly into the parent VCR. It takes a week to get M1 units (the lead time is one week), and the company has orders for the next five days of 32,44,36,54, and 41. How many M1 units should be on hand right now so that all orders can be filled?
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