A study of two kinds of photocopying equipmentshows that 61 failures of the first kind of equipment took on the average 80.7 minutes to repair with a stan-dard deviation of 19.4 minutes, whereas 61 failures of the second kind of equipment took on the average 88.1minutes to repair with a standard deviation of 18.8 minutes. Find a 99% confidence interval for the dif-ference between the true average amounts of time it takes to repair failures of the two kinds of photocopyingequipment.

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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.