An experiment was conducted to compare two diets A and B, designed for weight reduction. Two groups of 50 overweight dieters each were randomly selected. One group was placed on diet A and the other on diet B, and their weight losses were recorded over a 30-day period. The means and standard deviations of the weight-loss measurements (in kg) for the two groups are shown in the table. 
Find a 95% confidence interval for the difference in mean weight loss for the two diets. Interpret your confidence interval.
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