Health and Safety Executive – Lactate dehydrogenase – Statistics Assignment Help

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Statistics Assignment Help
Task:
The problem
Many industrial processes rely on the use of organic chemicals – including volatile solvents. Such compounds are sometimes described as xenobiotics, meaning that they do not exist in nature in any meaningful concentration – their existence is solely the result of human activity. Many of these chemicals, typically chlorinated hydrocarbons, are known to be hazardous, particularly by inhalation. Once in the blood stream they are capable of interfering with enzyme activity as well as interrupting genetic replication processes. Although the use of such chemicals is carefully monitored and regulated the HSE remain concerned about worker exposure.  As such the HSE takes the issue seriously and has undertaken a preliminary study via the agency of the accredited laboratory to look into any potential problems and it is the results of this study that you are commissioned to analyse.

The use of LDH as a warning sign

Lactate dehydrogenase (LDH) is an intracellular enzyme. It oxidizes lactate in the presence of NAD+ (oxidised form of nicotinamide adenine dinucleotide) or reduces pyruvate in the presence of NADH (reduced form of NAD). It is used clinically to determine cell damage in a number of organs including heart, liver, muscle and blood. There are 5 iso-enzymes of LDH. Changes in the level of iso-enzyme LDH-5 can be associated with liver function and as such elevated LDH-5 is deemed to be a useful indicator of the initial stages of liver damage that may be caused by exposure to many organic solvents. One method of gauging liver damage is to calculate the ratio of LDH-5 to LDH-1. The higher this value, the greater is the risk that liver damage is taking place. You have been provided with the value of this ratio (LDH-5: LDH-1) for each participant in the study. It is on the basis of the value of this variable that you are being asked to compare the workers’ health.

Your task

You a required to produce a coherent, concise, well presented and well-structured report which informs the HSE
whether or not there is genuine evidence of difference in the potential health hazard between workers at the different industries – as indicated by the LDH-5:LDH-1 ratio.

Further, you are required to report on
whether there is any association between worker length of service in the industry and the potential damage to their health.
In concluding the report you cannot assume that the HSE understands statistical methods in detail and you will therefore have to summarise your findings in plain non-technical language. The length of the report should be no longer than 7 pages or 2500 words. The word count excludes the cover sheet, table content, figure captions and references.
You are expected to:

introduce the type of question you are facing including hypothesis testing

produce appropriate descriptive/graphical summaries of the data

justify your choice and undertake the correct statistical tests

interpret any p-values and confidence intervals and correlation co-efficients correctly

arrive at brief and clear conclusions that directly answer the problem

you are free to explore and will be credited for any further analyses of the data you deem worthy of investigation

finally, are the HSE asking exactly the right questions – have potential confounding variables been adequately considered? Is this a well-designed study?

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