-). A new procedure for determining cholesterol in blood serum was used with a NIST standard sample producing the following results: 2.24, 2.21, 2.16, 2.21, and 2.19 mg/ml. If the NIST certified value is 2.12 mg/ml, determine if there a significant difference between the mean of the results and the certified or "true" value at the 95% confidence level?

-). A new procedure for determining cholesterol in blood serum was used with a NIST standard sample producing the following results: 2.24, 2.21, 2.16, 2.21, and 2.19 mg/ml. If the NIST certified value is 2.12 mg/ml, determine if there a significant difference between the mean of the results and the certified or "true" value at the 95% confidence level?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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1. A wastewater sample has the following composition: NO3 = 37 mg/L as N CO3²-2.5 x 10 mol/L PO4³ = 10 meq/L Ca²+ = 75 mg/L as CaCO3(s) Express each of the above concentrations in mg/L, mol/L, meq (of charge)/L, and ppm. Make and list any necessary assumptions. Show your work and summarize the results in a table.
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potassium hydrogen phthalate is a primary standard used to measure the concentration of NaOH solutions. find the true mass of potassium hydrogen phthalate (density=1.636g/ml) if the mass weighed in the air is 4.236g. if you did not correct the mass for buoyancy, would the calculated molarity be too high or too low? the density of air is 0.0012 g/mL while that of the calibration weights is 8.0 g/mL.
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