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If you wanted to know if your average absorbances for pH 7 and pH 11 were different, what preliminary calculation would you preform?
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- How would you calculate the expected values from the observed in order to use the chi-squared test?What would the critical chi-square value be if my test involves six classes? 12.59 7.81 9.49 11.07Two students independently determine the volume of water delivered by a 10.00-mL pipet. Each student takes 8 measurements, then computes the average volume delivered and the standard deviation. The results are tabulated below. Average St. Dev. Student A 10.4 mL ±0.7 mL Student B 10.00 mL ±0.02 mL Which statement best describes the results? 1)A: good precision, poor accuracy. B: poor precision, good accuracy. 2)A: poor precision, good accuracy. B: good precision, poor accuracy. 3)A: poor precision, poor accuracy. B: good precision, good accuracy. 4)A: good precision, good accuracy. B: good precision, good accuracy. 5)A: poor precision, poor accuracy. B: poor precision, poor accuracy.
- Given the following Data Conc Abs 0.983 0.821 0.876 0.689 0.624 0.427 0.411 0.223 0.297 0.147 Construct a curve and using linear regression determine the concentration if the absorbance is 0.104? (You may use your calculator or excel)Answer briefly: Discuss the value of international normalized ratio (INR) as a test. Why do you think this is more reliable that the ordinary PT.Perform the calculations and determine the absolute and percent relative uncertainty. Express each answer with the correct number of significant figures. To avoid rounding errors, do not round your answers until the very end of your calculations. 7.8 (±0.3) – 2.03 (±0.02) = absolute uncertainty: percent relative uncertainty: 8.24 (+0.04) × 0.012 (+0.001) = absolute uncertainty: percent relative uncertainty: G Search or type URL % & ) 6 8 9 P R F H K M
- Please discuss the value of international normalized ratio (INR) as a test. Why do you think this is more reliable that the ordinary PT.In this question, you need to discuss the results you obtained from the BSA standards to generate your standard curve. Are you confident in the absorbance values you measured from the BSA standards? Was there variability between your duplicates? Comment on the shape of your standard curve and note the highest absorbance you would consider for interpolating the concentration of an unknown sample.In the experiment performed for the determination of cholesterol, the function of the calibration curve obtained using 25-400mg/dL standard cholesterol solutions was determined as y= 0.0009x. If the absorbance of the serum sample is determined as 0.28, what is the amount of cholesterol in the sample, in mg/L?
- You are to prepare capsules that contain 0.125 g of a drug. You have four partial containers of medicatiog, which weigh 3.2 g, 1.784 g, 2.46 g, and 5.87 g. Assume you have weighed each of the four containers with the same scale, and the accuracy is known to the hundredth gram. a Which amount will need to be rounded? b. Which amount is not as accurate as it should be? c. What is the amount of the medication that will be left over after making as many 0.125 g capsules as possible?You are given a 27 % (w/v) solution of psicose. Molar mass: psicose (C6H12O6) = 180.156 g/mol. ou have a 0.75 mg/mL solution of bovine serum albumin (BSA). You add 1 mL of the 0.75 mg/mL BSA solution into a standard cuvette (1 cm path length), set your spectrophotometer to 280 nm and read the absorbance of this BSA solution. Molecular mass of bovine serum albumin = 66.4 kDa. Molar extinction coefficient (e) of BSA = 43824 M-1 cm-1 (at 280 nm). What absorbance reading will you obtain?In a case-control aimed at studying exposure to perfluoroalkyl substances (PFAS) and asthma, the following data were collected: A=10 B=209 C=50 D=230 Create a two-by-two table and calculate the OR for the association between exposure to PFAS and asthma. Interpret the results.