SOLUTION: Aimed to study whether calcium ion had an effects on weight, a researcher divided 36 fat rats into 3 groups randomly. And the feed for each group contained different dosage of calc

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Question 935329: Aimed to study whether calcium ion had an effects on weight, a researcher divided 36 fat rats into 3 groups randomly. And the feed for each group contained different dosage of calcium ion: Group 1�normal dosage (0.5%), Group 2�mid dosage (1.0%), Group 3�high dosage (1.5%). After 9 weeks, measure the weight, and record the difference before and after treatment
Group 1 Group 2 Group 3
332.96 253.21 232.55
297.64 235.87 217.71
312.57 269.3 216.15
295.47 258.9 220.72
284.25 254.39 219.46
307.97 200.87 247.47
292.12 227.79 280.75
244.61 237.05 196.01
261.46 216.85 208.24
286.46 238.03 198.41
322.49 238.19 240.35
282.42 243.49 219.56

Please give me the conclusion whether there were difference(s) among the three groups with different feed, and point out which two groups had significant difference, at the level of α=0.05.

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