Statistics - Batch AQL? (Acceptance Quality limit) HNC

In summary, the conversation discusses the production and inspection process for an electrical device, with specific considerations for temperature. The speaker is seeking help with determining the acceptability of a production lot and provides information on the sample code letter, sample size, and acceptability constant. They also mention temperature measurements for a sample taken and ask for a determination on whether the lot should be accepted.
  • #1
SWINEFLU
4
0
Hi All,

Currently on a distance learning HNC and I am not quite sure whether the question just wants me to answer 'yes' or give mathematical evidence. Part A answered, Part B not sure... Any help would be great!

2. The process for the production of an electrical device is suitable for inspection by variables. Production is inspected in lots of 150, at inspection level II, normal inspection with AQL = 2.5%. The maximum temperature of operation for the device is specified as 50 °C.

(a) Use TABLES 4 and 5 to find the sample code letter, the sample size and the acceptability constant.
Code letter H
Sample Size 10
Acceptability constant 1.41

(b) A sample is taken and the temperature measurements are as follows:
43 °C, 49 °C, 46 °C, 39 °C, 44 °C, 45 °C, 40 °C, 48 °C, 46 °C and 41 °C.
Determine whether the lot should be accepted.
 
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  • #2
Moved to homework section. No template because of move.
 

1. What is Batch AQL in statistics?

Batch AQL (Acceptance Quality Limit) is a statistical method used to determine the acceptable level of defects in a batch of products. It is commonly used in quality control to ensure that the products meet the desired level of quality before being released to the market.

2. How is Batch AQL calculated?

Batch AQL is calculated by using a statistical formula that takes into account the batch size, the acceptable quality level, and the sampling plan. The result is a number that represents the maximum number of defects that can be accepted in a batch.

3. What is the purpose of using Batch AQL?

The purpose of using Batch AQL is to ensure that the quality of the products in a batch meets the desired level of quality. It helps to identify and reject batches that do not meet the acceptable quality level, preventing defective products from reaching the market.

4. What are some common sampling plans used in Batch AQL?

Some common sampling plans used in Batch AQL include single sampling, double sampling, and multiple sampling. These plans determine the number of units that need to be inspected from the batch and the number of defects that are allowed in the sample before the batch is rejected.

5. Are there any limitations to using Batch AQL?

Yes, there are some limitations to using Batch AQL. It assumes that the defects are randomly distributed throughout the batch, which may not always be the case. It also does not take into account the severity of defects, which may vary in impact. Therefore, it is important to use Batch AQL in conjunction with other quality control methods to ensure the overall quality of the products.

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