During the Covid-19 outbreak, the global Personal Protective Equipment (PPE) market has been growing at a rapid pace. A local company producing PPE kits, such as masks and gloves, wants to predict its sales only for gloves. Forecast the demand of gloves for each time period, including May 2021, using the Naive approach and exponentially smoothing with a smoothing constant parameter of 0.6. Assume that the initial forecast equals the initial demand. Apply Regression analysis to forecast demand in June 2021.
Period Demand (Boxes) Sum of the numbers in your student ID
Nov. 2020 5500
Dec. 2020 6500 0-18
Jan. 2021 7800 19-23
Feb. 2021 24-26
March 2021 11800 27+
The initial demand with * depends on the student ID:
5700
5300
4350
6200
A recently founded factory manufacturing electronic components for a medical surgery robot has been having difficulty managing quality-related problems. Hence, industrial engineers working at the quality management department have decided to implement a statistical control chart in one of its processes. Based on the collected data illustrated in Table 1, set up an X-R control chart and determine the control limits for the control chart(s) for the seven samples with a size of four. Is the process under control or not?
Sample Observations
2
5
9
7
x1 0.11
0.25
0.14
0.29
0.19
0.25
x2 0.22
0.24
...
0.16
***
0.23
x3 0.31
0.22
0.31
0.22
...
0.27
0.55
x4 ...
0.19
*..
0.19
0.25
0.33
...
Sum of the numbers in your student ID
*** 0-18
0.17
19-23
0.28
24-26
0.41
27+
0.21