A chicken farmer received complaints that the eggs’ shells were very weak. She is looking to increase the amount of calcium the chicken receive. She separates her hens into 4 groups: the first will receive oyster shells, the second will receive eggs shells, the third will receive salmon and the fourth is the control group. Over four weeks of the new dietary supplements, the chicken farmer counts how many weak shelled eggs in 100 eggs were produced by each group. According to the farmer’s data, did the supplements improve the strength of the egg shells? If so, which supplement was most effective?