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The U.S. department of agriculture provided homogenized baby food samples to three labs for analysis. Results for iron were questionable:Lab A 1.59 + or - 0.14(13); Lab B, 1.65 + or - 0.56(8); lab C, 2.68 + or - 0.78(3) mg/100g. Use two separate t tests to compare results from lab Coat with those from lab A and lab B at the 95% confidence level. Comments on the sensibility of the time test results.

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