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A veterinary nutritionist developed a diet for overweight dogs. The total volume of food consumed remains...

A veterinary nutritionist developed a diet for overweight dogs. The total volume of food consumed remains the same, but one-half of the dog food is replaced with a low-calorie "filler" such as canned green beans. Six overweight dogs were randomly selected from her practice and were put on this program. Their initial weights (in pounds) were recorded, and they were weighed again after 4 weeks. Compute a 95% confidence interval for the average difference in weight for Before - After with this diet.

Before 42 53 48 65 40 52
After 39 45 40 58 42 47

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