Business Focus B2C B2B Total A survey of B2B marketers (marketers that focus primarily on attracting businesses) and B2C marketers (marketers that primarily target consumers) was based on 1000 B2B….
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A dimension of a rheostat knob was specified to be 0.140 ± 0.003 inches.
A dimension of a rheostat knob was specified to be 0.140 ± 0.003 inches. Otherwise the knob would not fit into another part. Five knobs from each each hour’s production were inspected and the dimension was recorded (in units of 0.001 inches) in the following . The sample means and sample ranges are recorded in the last two columns. (a) Draw the histogram of the raw data using the class marks: 132, 134, 136, 138, 140, 142, 144, 146, 148. How many rheostats are non-conforming? (b) Is the process in statistical control? Draw the x and R charts to find out.
(Source: E.L. Grant and R.S. Leavenworth (1996), Statistical Quality Control, 7th ed., McGraw-Hill. Used with permission.)
