Briefly comment on the following:
a) “Measuring variability is of great importance to advanced statistical analysis.”
b) “Opinion polls are a very common method of gaining knowledge about consumer tastes”.
c) “Probability theory provides us with the ways and means to attain the formal and precise expressions for uncertainties involved in different situations”.
d) “The primary purpose of correlation is to establish an association between any two random variables”. 

a) Measuring variability is indeed crucial to advanced statistical analysis. Variability refers to how much the values in a data set differ from each other, and it provides important information about the distribution and spread of the data. Advanced statistical techniques, such as regression analysis and hypothesis testing, rely on accurate measurements of variability to draw meaningful conclusions from data.

b) Opinion polls are indeed a ____ _________ _____ _________ ____ ____.
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