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What is an rf value used for?
The rf value is shorthand for the retention value of a substance. It is used in chromatography to determine the components of an unknown sample.
When to you use a z-scores or t-scores?
T score is usually used when the sample size is below 30 and/or when the population standard deviation is unknown.
What is the difference between t-distribution and standard normal distribution?
the t distributions take into account the variability of the sample standard deviations. I think that it is now common to use the t distribution when the population standard deviation is unknown, regardless of the sample size.
In statistics what is Pi used for?
In statistics, pi represents the population proportion of successes. Using p, the sample proportion of successes, inferences can be made about pi, although it is usually unknown.
What is the difference between sample and sample size?
a sample is a sample sized piece given... a sample size is the amount given in one sample
