# to answer some questions on Excel sheet

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Calibration and Statistics Problem Set

A calibration curve for cadmium is prepared using the following experimental results from a graphite furnace atomic absorbance experiment.

Chemistry 366 Homework Problem Set Widener University Dr. Van Bramer January 2019 Calibration and Statistics Problem Set A calibration curve for cadmium is prepared using the following experimental results from a graphite furnace atomic absorbance experiment. [Cd] (ppm) 0.00 0.75 1.05 2.25 3.00 4.50 7.50 10.50 13.80 14.70 15.00 Absorbance 0.129 0.098 0.312 0.336 0.488 0.818 1.05 1.551 2.033 2.194 2.192 Five different soil samples were analyzed. Each soil sample is extracted with 1.0 mL of nitric acid and the nitric acid solution is analyzed. Determine the concentration of cadmium in each of these samples: Sample 1 2 3 4 5 Sample mass (g) 0.4935 0.5583 0.5107 0.5177 0.4940 Absorbance 0.599 0.701 0.596 0.601 0.564 1. Based on the variance in these five replicate samples; determine a. The average concentration of mercury b. The standard deviation in the concentration of mercury c. The 95% confidence interval for the concentration of mercury d. Use the Q-test to determine if sample 5 is an outlier 2. A second laboratory conducts the same analysis and finds the following results. Determine if there is a significant difference between the two laboratories at the 90% confidence interval. Sample 1 2 3 4 5 Sample mass (g) 0.4957 0.5052 0.4822 0.4887 0.5117 Absorbance 0.5918 0.6163 0.5680 0.5778 0.6091 3. The sample being used is actually a standard reference material and the accepted value for this analysis is 7.89 ppm. Is there a significant difference at the 90% confidence interval between the experimental results from each lab and the accepted value?

proggerardo
School: UCLA

Attached you will find the outline and answers of the problem set. Please let me know if you need modifications or clarification ðŸ˜Š

Calibrati

0.129
0.098
0.312
0.336
0.488
0.818
1.050
1.551
2.033
2.194
2.192

2.500
2.000

ABSORBANCE

Calibration Curve
[Cd] (ppm) Absorbance
0.0
0.8
1.1
2.3
3.0
4.5
7.5
10.5
13.8
14.7
15.0

1.500
1.000
0.500
0.000
0.0

SLOPE
INTERCEPT
R2

2.0

4.0

0.1412 SLOPE(B3:B13,A3:A13)
0.0805 INTERCEPT(B3:B13,A3:A13)
0.9941 POWER(CORREL(B3:B13,A3:A13),2)

Sample Analysis. Lab 1.
Sample
Sample mass (g) Absorbance [Cd] (ppm) in 1mL [Cd] (ppm) in 1g
1
0.4935
0.599
3.7
7.4
2
0.5583
0.701
4.4
7.9
3
0.5107
0.596
3.7
7.1
4
0.5177
0.601
3.7
7.1
5
0.494
0.564
3.4
6.9
QUESTION 1

1A AVERAGE
1B STD DEV
1C 95% INTERVAL

1D Q-TEST

7.3 AVERAGE(E21:E25)
0.4 STDEV.S(E21:E25)
s/âˆšn 0.163846 E28/SQRT(5)
Value 7.3 Â± 0.5

Q 0.200999 ABS...

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Anonymous
Thanks, good work

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