A new water fountain designed for cups/bottles has a program that is designed to stop after it has dispensed 12 oz of water. However, several of the staff who use the
fountain have noticed that their cups are slightly lower than usual. As a test, they
obtain a random sample of 5 cups of water, and set up the null hypothesis that the
mean oz of water = 12, against the alternative that it is in fact less. If the machine
operates with a known standard deviation of 0.9 oz, which of the following best
describes a test statistics that would lead the employees to conclude their machine is
not working properly?

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step-by-step explanation:

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.