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Why is a sample usually preferred over a census?
Less time and less cost for a sample.
Why is geometric progression preferred over arithmetic progression?
The question cannot be answered because it assumes something which is simply not true. There are some situations in which arithmetic progression is more appropriate and others in which geometric progression is more appropriate. Neither of them is "preferred".
What is the preferred method of solicitation when conducting simplified acquisitions over the micro purchase threshold?
The required sources of supplies and services can be found in:
Why pid is preferred over other controllers like pi and pd?
it because pid has the derivative part ,which will predict the disturbance .so helps in antisipating the errors & correcting them in advance.
What does a above a number mean in statistics?
The special character in your question didn't come through.If it was a horizontal bar then it implies the sample mean; for example, for a sample of 'x' values (usually numbered 1, 2, 3, ..., n) x with a bar over it would mean the statistical average or mean of these numbers.If the special character was a caret then it implies any of a variety of statistical estimators. For example, if you had assumed for some reason that the data had arisen from a population with a Poisson distribution with parameter 'lambda' then you might see a Greek letter lambda with a caret over it to represent a formula for calculating a statistical estimate of that parameter.
