- Question Parts Manufactured By An Injection Molding Process Are Subjected To A Compressive Strength Test 10 Samples Wi 1 (132.85 KiB) Viewed 40 times
Question: Parts manufactured by an injection molding process are subjected to a compressive strength test. 10 samples with variable size are collected, and the compressive strengths (in psi) are shown in Table 1. Strength Sample X2 Number B3 BA s chart LCL UCL -T 1 2 3 4 5 6 7 8 9 10 X1 X3 X4 X5 Az I chart LCL UCL 80.0 81.5 78.4 73.8 78.1 80.6 81.879.3 82.7 81.3 79.1 | 82.0 79.5 79.2 74.9 78.6 80.5 82.1 78.8 79.6 80.278.280.8 82.1 78.275.5 84.5 76.9 83.5 79.0 77.8 84.5 73.1 78.6 78.7 Table 1. Strength Data - 1. Complete Table 1. 2. Determine the grand mean X and 5 the average standard deviation. 3. Compute the control limits for the 7 and s control charts. 4. Construct an # and s control charts. Does the process exhibit statistical control? 5. Use SPSS or Minitab to Construct 7 and s control charts. Does the process exhibit statistical control? 6. Comment the following Minitab output X bar-S Chart of x1; ...; X5 85 UCL=83.48 BO Sample Mean x=79.53 LcL7557 10 13 14 15 16 17 18 Sample UCL=5.505 Sample StDev S=2.429 LCL-0 10 11 12 13 14 15 16 17 18 Sample Tests are performed with unequal sample sizes. Figure 1. Fand s charts for Strength data of the process.