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(Solved): Parts manufactured by an injection modeling process are subjected to a compressive strength tesi. T ...
Parts manufactured by an injection modeling process are subjected to a compressive strength tesi. Twenty samples of five parts each are collected, and the compressive strengths (in psi) are shown in the Table below.
If you want to establish bar and chart for this data. What is the L.CL for bar chart? 84.58 74.49
Expert Answer
To determine the LCL (lower control limit) for the X-bar chart, we first need to calculate the X-bar value and the standard deviation of the sample means.The X-bar value is calculated by finding the mean of all the sample means, which is:X-bar = (79.1 + 80.2 + 80.4 + 77.5 + 77.3 + 81.4 + 75.7 + 78.4 + 79.4 + 80.9 + 77.1 + 79.1 + 79.7 + 79.2 + 81.1 + 79.2 + 81.1 + 80.8 + 80.8 + 75)/100 = 79.44 psi