Furthermore, it is assumed that the sampling distribution of the sample mean can be approximated by a normal distribution because the sample size of each sample is size One of the conditions that should be satisfied when a random sample is selected from an infinite population is that each element selected comes from the same population.
This is because Alibaba Machinery does not want to either underfill or overfill its shampoo. Thus the relatively low mean is an indication that there are low-lying weights which have affected the mean.
During each of the chosen clusters which are purposefully chosen to be at hourly intervalsa sample of only 30 are selected, using systematic sampling method.
The lowest bottle weights are in Sample 3. The test was calculated for each sample at the 0. Some variation in weights of the bottles of shampoo is expected.
One reason may be the following: The hypothesis test suggested by Quality Associates is: This expected variation is due to a number of factors, which may include the temperature of the machine, variations in the thickness of the shampoo, …??? It is assumed that the population standard deviation is 0.
This assumption is based on the Central Limit Theorem, which states that in selecting random samples of size n from a population, the sampling distribution of the sample mean can be approximated by a normal distribution as the sample size becomes large.
More Essay Examples on Sampling Rubric If the machine is not operating satisfactorily, corrective action can be taken to eliminate the problem. To ensure that this condition is satisfied, the bottles must be selected at approximately the same point in time p.
Observing the data shows that sample 3 has the lowest weight out of all the samples, which is As such, further investigation should be made by the company to determine the reason why the weights were significantly less than 12 fl. After each of the four samples have been analysed individually, some analysis is also undertaken for the overall observations as a whole.
Underfilling may result in a complaint from customers or a government agency, and overfilling would be an unnecessary cost to the company.
Another limitation may be the systematic sampling method used to collect each sample. The problem may not be due to malfunctioning of the machine, since the machine operated satisfactorily again in Sample 4. The mean is a type of average which is affected by every observation in the sample, whereas the median is not.
The design specification indicated that the mean weight of the bottles of shampoo should be 12 fluid ounces fl. Moreover, the quality of the bottle i.
Moreover, the assumption is made that lunch time at Alibaba Machinery is from 12 — 1pm, during which time the machine is turned off. Target population is p.
In the methodology assumed to be used for this case study, the 30 bottles selected for each sample are selected within a period of one hour.
This is for comparative purposes, since it is expected that as the size of the sample increases, the sample mean should be closer to the population mean.Quality Associates, Inc.
helps client scan and convert more thanpages in a 90 day timeframe Background BizTech Fusion is a business consulting.
Scribd is the world's largest social reading and publishing site. Case 7 Quality Associates Essay CASE 7 – QUALITY ASSOCIATES INC. BACKGROUND (CASE STUDY WRITE UP) Quality Associates, Inc. is a consulting firm who advises its clients about statistical and sampling methods that can be used to control their manufacturing procedures.
Quality Associates is a full service POP/POS display & assembly provider with 4 national sites. Founded inQA is a certified Minority Business Enterprise (MBE).
Quality Associates, Inc., a consulting firm, advises its clients about sampling and statistical procedures that can be used to control their manufacturing processes. In one particular application, a client gave Quality Associates a sample of observations taken during a time in which that client’s process was operating satisfactorily.
case 7 – quality associates inc. BACKGROUND (CASE STUDY WRITE UP) Quality Associates, Inc. is a consulting firm who advises its clients about statistical and sampling methods that can be used to control their manufacturing procedures.Download