The compression ratio for an engine is defined by the expanded volume: compressed volume. the larger the compression ratio is, the more powerful the engine. what is the compression ratio if the expanded volume is 400 cc and the compressed volume is 260 cc? round your answer to the hundredths place if necessary. make sure your answer has a 1 in the denominator or the right hand value.

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

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