he road octane numbers of two different formulations of gasoline are being studied. A random sample of size n, =15 is taken for formulation 1; hile, for formulation 2, the random sample size is na =20- The variance of the octane number for formulation 1 is it is o,2 = 1.2: The mean octane numbers observed are x, = 89.6 and x, = 92.5. Assume normality. What is the upper limit of a 95% two- ded confidence interval on the difference in mean octane number 0,2 = 1.5, and for formulation

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.