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The concepts of accuracy and precision are not always easy to grasp. Here are two sets of studies: (a)The mass of a secondary weight standard is determined by weighing it on a very precise balance under carefully controlled laboratory conditions. The average of 18 different weight measurements is taken as the weight of the standard. (b)A group of 10,000 males between the ages of 50 and 55 is surveyed to ascertain relationship between calorie intake and blood cholesterol level. The survey questionnaire is quite detailed, asking the respondents about what they eat, smoke, drink, and so on. The results are reported as showing that for men of comparable lifestyles, there is a 40% chance of the blood cholesterol level being above 230 mg/dL for those who consume more than 40 calories per gram of body weight per day, as compared with those who consume fewer than 30 calories per
gram of body weight per day. Discuss and compare these two studies in terms of the precision and accuracy of the result in each case. How do the two studies differ in ways that affect the accuracy and precision of the results? What makes for high precision and accuracy in any given study? In each of these studies, what factors might not be controlled that could affect the accuracy and precision? What steps can be taken generally to attain higher precisionand accuracy?
Find out the mass of precipitate in grams that forms when 286.7mL of 0.112 M Na2SO4 solution is reacted with excess Ba(NO3)2 solution. Balanced Equation ---> 2Na(NO3) + BaSO4
a sample of propanec3h8 contains 10.8 moles of carbon atoms. how many total moles of atoms does the sample
Determine the hydraulic conductivity and transmissivity of the aquifer and What would Q be if the hydraulic gradient
The solution diluted in half by water (1 mL of X and 1 mL of H2O) has an absorbance at 425 nm of 0.8 and a molar extinction coefficient of 1.5 ? 103 M-1 cm-1. What is the molar concentration of the original solution of X? (1 cm cuvette)
Choose all of the processes from below which describe changes which are independent of the path by which the change occurs the elevation increase experienced by a traveller travelling from Grand Isle
which of the following substances will be soluble in the non-polar solvent carbon tetrachloride ccl4? select all that
Classify the following as exothermic or endothermic reactions: a) The energy level of products is lower than that of the reactant. b) In the body, the synthesis of proteins requires energy. c) 125kJ is absorbed.
The volume of a 24.0-g sample of methane gas is 22.8 L at 40.0°C and 4.00 atm. What will its volume be at 68.0°C and 4.00 atm.
A solution contains 10.0 g pentane, C5H12, 10.0 g hexane, C6H14 and 10.0 g benzene, C6H6. What is the mole fraction of hexane?
A sample of 10mL of a solution of KBr has a mass pf 12.60g. While the solution is evaporated, the residue weighs 3.80g. With this data determine:
aluminum oxide decomposes to produce aluminum metal and oxygen gas. When 9.8g of aluminum oxide decomposes, how many grams of aluminum are produced?
how many joules are required to melt a 325 degrees Celsius ice cube at 0 degrees Celsius and to warm the liquid to 15 degrees Celsius
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