To assess the effectiveness of a new appetite reduction therapy, five subjects are randomly selected. Before participating in the therapy program, the daily calorie intake of the five participants is measured. After participating in the program, the calorie intake of the five participants is measured again. The table below shows before and after results. In this matched samples experiment, build a 90% confidence interval estimate of the average difference in daily calorie intake for the populations represented.

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Calorie Intake Subject 1 Before After 2340 2190 1960 3450 2960 1950 2230 1670 2920 2475