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Measurements of strontium in enamel from extracted wisdom teeth were done by atomic absorption spectroscopy. Solutions were prepared with a constant total volume of 10.0 mL containing 0.750 mg dissolved tooth enamel plus variable concentrations of added Sr. Added Sr Signal (ng/mL = ppb) (arbitrary units) 0 28.0 2.50 34.3 5.00 42.8 7.50 51.5 10.00 58.6 1) Find concentration of Sr in tooth enamel in parts per million (micrograms Sr per gram tooth) 2) Find 95% confidence interval for Sr in tooth enamel

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