Use a spreadsheet program, such as Microsoft Excel, to graph the data points and determine the equation of the best-fit line. What is the slope of the linear regression line formed by these points? m = What is the intercept of the linear regression line? M-1

Solving a proportion of the form a/(x+b) = c/x Solve for x. 4 8 %3D x-4 x-6 X = ?.

4. Two technicians have analyzed a standard with a known nitrate concentration of 25.0 mg/L. The results are shown below. Results from Technician 1 (mg/mL) Results from Technician 2 (mg/mL) 23.4 23.8 TO 23.2 Trial 1 2 3 4 5 23.4 22.9 23.6 Average: 23.4 30.1 22.4 27.5 21.3 Average: 24.9 Choose the statement below which is FALSE. a. Technician 2 has greater accuracy than technician 1. b. Technician 1 has greater precision than technician 2. c. Results from technician 1 have both systematic and random error. d. Results from technician 2 only have determinant error.

Use a spreadsheet to calculate the mean and standard deviation of the data set. 54.99, 54.40, 54.60, 54.63, 54.36 The figure shows a suggested setup for your spreadsheet, where you enter the data in the highlighted cells and enter formulas in cells C4:D8 and B9:B11 to carry out the appropriate calculations. mean: standard deviation:

STARTING AMOUNT X 0.1 10-⁹ A human hair is 75.0 ADD FACTOR x( ) 0.0000300 104 3.00 1 2.54 um across. How many inches is this? 0.001 10⁹ 10-6 ANSWER 100 0.01 1000 30.0 0.00300 104 RESET 2 0.330 75.0 10.0 106

I need help on figuring out which are the four data points that can be considered outliers, below is my graph following the intructions but, not I dont know which points are outliners.

A bucket of water has a volume of 0.473 kL . How many dL is this? STARTING AMOUNT ADD FACTOR ANSWER RESET *( ) 47300 1000 0.001 0.01 10 4730 0.0000473 100 0.473 0.1 1 0.00473 473 0.000473 kL dL +

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2. Estimate the absolute deviation and the coefficient of variation for the results of the following calculations. Round each result so that it contains only significant digits. The numbers in parentheses are absolute standard deviations. 2 (1.203 (+0.004) x 103 + 18.25 (10.005) x 102 – 34.012(±0.001)) 3.9201 (+0.0006) x 10-3 y =

8.0 cm 5.8 cm 3.9 cm 1.5 cm A B C D Figure 2. Developed TLC plate of commercial analgesic and standards Use the data presented in Figure 2 as basis for your answer. The TLC plate used is 5 cm by 10 cm. Note that dot A is for the commercial analgesic, dot B is for the aspirin standard, dot C is for the acetaminophen standard, and dot D is for the caffeine standard. What component/s islare present in the commercial analgesic as confirmed on the developed chromatograph?