Twelve randomly selected mature citrus trees of one variety have a mean height of 13.8 feet with a stan-dard deviation of 1.2 feet, and 15 randomly selected mature citrus trees of another variety have a meanheight of 12.9 feet with a standard deviation of 1.5feet. Assuming that the random samples were selected from normal populations with equal variances, con-struct a 95% confidence interval for the difference between the true average heights of the two kinds of cit-rus trees.

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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.