MNO2602 ASSIGNMENT 4 SEMESTER 1 2025 (CORRECT ANSWERS ) DUE DATE 2025 GUARANTEED DISTINCTION.

Assignment 4 MNO2602 Semester 1/2025 Question 1 [16 marks] 1.1 Distinguish between random variation and nonrandom variation in a process. 1.2 Discuss the different nonrandom signals that can occur when using a process control chart to analyse a process. 1.3 Explain the various types of attributes. (6) (5) (5) Question 2 [10 marks] 2.1 A certain hotel would like to analyse the time (measured in minutes) it takes for the guests’ luggage to be delivered to their rooms. The following data was recorded over a 5-day period. Day Time (min) 1 6.7 11.7 2 7.6 9.7 11.4 3 9.5 9.0 8.9 4 9.8 9.9 13.2 5 11.0 6.9 9.9 11.3 Calculate the control limits for an x chart, with the range as measure of dispersion. (5) 2.2 A manufacturer of ceramic tiles subjects their tiles to several quality checks. Tiles with surface deformities or not meeting specifications are marked as defective. The table below shows the number of defective tiles in 7 samples consisting of 50 tiles each. Sample number 1 2 3 Number of defective tiles 4 5 6 7 7 5 6 3 3 6 2 The quality control specialist calculated the control limits for a p chart, obtaining UCL = 0.21 and LCL = 0.00. Use the data and information above to construct the p chart. (5) Assignment 4 MNO2602 Semester 1/2025 Question 3 [14 marks] 3.1 A cri