I already have calculated for question #4 and got these numbers
xdouble bar=28.07 UCL=29.08 LCL=27.08 ,Rbar=1.74, UCL=3.67, LCL=0 Sample Size=5
Continuing on from question #4, the employee continues to track the same data for 10 weeks after the supplier change, and gets the following data:
Sample data: |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
Mean |
27.8 |
28.9 |
27.4 |
28.7 |
28.0 |
27.1 |
27.2 |
27.3 |
28.0 |
27.4 |
Range |
2.3 |
1.5 |
3.0 |
2.1 |
3.2 |
2.2 |
3.6 |
2.0 |
3.4 |
1.7 |
The Operations manager looks at the data and points out that the strength has gone down as he claims, as the average of these new readings is below the previous average, and the average range of the samples is also higher, which he claims proves there is more variability. Should the company change back to the original supplier? Why or why not?
Multiple Choice
All the new sample means fall within control limits, as do all the new sample ranges. Therefore, the process is “under control”, which means there has been no assignable variation. The supplier change therefore did not have an impact and they should not change back.
The operations manager is correct, and there the new supplier has added additional variability to the process. They should therefore change back to the original supplier.
Calculating new control limits for the new data, shows that the process is in control, so they should not change back.
Calculating new control limits for the new data gives clearly different control limits. There therefore has been an assignable change in variation, so they should change back to the original supplier.
Option (1) is correct (assuming what you have computed in the first part is correct)
All the sample mean and ranges are within their respective [LCL, UCL] ranges and may not need any corrective action. The variations within the range are assumed to be random and do not correspond to any special cause.
I already have calculated for question #4 and got these numbers xdouble bar=28.07 UCL=29.08 LCL=27.08 ,Rbar=1.74,...
The Operations manager at a large widget factory is complaining that since the company has changed to a cheaper supplier for one of the raw materials used for widgets, the quality of their widget has changed. In fact, he has one of the final widgets that has a strength testing below their spec. The new operations employee had previously taken 5 samples each week over a 10-week period, and logged the data in the chart below. Calculate upper and lower...
What is a control chart? What are its main features and how is
it used?
I included the definition of a control chart so
there isn't any confusion. Please include an explantion in your own
words.
Control Chart
Assuming production engineers have gotten everything to work
such that the process conforms to specifications (the average of
the process is close to the target value and the variability
[standard deviation] is very small), after that they have to ensure
that the...
A pizza restaurant monitors the size (measured by the diameter) of the 10-inch pizzas that it prepares. Pizza crusts are made from doughs that are prepared and prepackaged in boxes of 15 by a supplier. Doughs are thawed and pressed in a pressing machine. The toppings are added, and the pizzas are baked. The wetness of the doughs varies from box to box, and if the dough is too wet or greasy, it is difficult to press, resulting in a...
I need Summary of this Paper i dont need long summary i need
What methodology they used , what is the purpose of this paper and
some conclusions and contributes of this paper. I need this for my
Finishing Project so i need this ASAP please ( IN 1-2-3 HOURS
PLEASE !!!)
Budgetary Policy and Economic Growth Errol D'Souza The share of capital expenditures in government expenditures has been slipping and the tax reforms have not yet improved the income...
summarizr the followung info and write them in your own words and break them into different key points. 6.5 Metering Chamber: 6.5.1 The minimum size of the metering box is governed by the metering area required to obtain a representative test area for the specimen (see 7.2) and for maintenance of reasonable test accuracy. For example, for specimens incorporating air spaces or stud spaces, the metering area shall span an integral number of spaces (see 5.5). The depth of...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...