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Answer the following question The following observations were made cn fracture toughness of a base plate...
The following observations were made on fracture toughness of a base plate of 18% nickel maraging steel (in ksiin., given in increasing order)]: 65.2 71.9 72.8 73.1 73.1 73.5 75.5 75.7 75.8 76.1 76.2 76.2 77.0 77.9 78.3 79.6 79.7 79.9 80.1 82.2 83.7 93.5 Calculate a 99% CI for the standard deviation of the fracture toughness distribution. (Round your answers to one decimal place.) (C . ksiin Is this interval valid whatever the nature of the distribution? Explain. The...
The following observations were made on fracture toughness of a base plate of 18% nickel maraging steel (in ksi Vin, given in increasing order)] 70.0 71.9 72.6 73.1 73.3 73.5 75.5 75.7 75.9 76.1 76.2 76.2 77.0 77.9 78.1 79.6 79.7 79.9 80.1 82.2 83.7 93.0 (a) Calculate a 99% CI for the standard deviation of the fracture toughness distribution. (Give answer accurate to 2 decimal places.) Is this interval valid whatever the nature of the distribution? Explain. Yes, the...
6.15. Parts manufactured by an injection molding process are subjected to a compressive strength test. Twenty samples of five parts each are collected, and the compressive strengths (in psi) are shown in Table 6E.11. (a) Establish 7 and R control charts for compressive strength using these data. Is the process in statis- tical control? (b) After establishing the control charts in part (a), 15 new subgroups were collected and the com- pressive strengths are shown in Table GE.12. Plot the...