# Seminary of the Southwest Data Handling & Statistical Terms Worksheet

Chem. 275Dr. Ng
Classwork / Homework
Data Handling & Statistical Terms
1. What are the three most common types of determinate errors? Give at least 2 examples
for each type.
2,
(a) Give the answer of the following operation to the maximum number of significant
figures and indicate the key number. (b) What is the relative uncertainty of the answer?
40.38 x 792
123.5 x 0.4365
(b) Relative Uncertainty = ________________________
3.
Round the following number to the closest decimal place
(a) 3.78
_______________
(b) 4.65 _________
1
Chem. 275
Dr. Ng
4.
If a 2.62 g of material is analyzed to be 2.52 g, What is the absolute error? What is
relative error ?
Absolute error = ___________
Relative error = ____________
5. The following replicate weighing were obtained: 29.8, 30.2, 28.6, and 29.7 mg. Calculate
(a) the standard deviation of the individual values (b) the standard deviation of the mean,
and (c) the relative standard deviation
Hint:
1. Write down the equation for standard deviation :________________________
2. Fill out the following table
Table
xi
29.8
30.2
28.6
29.7
Mean = ?
?
?
Sum = ?
(a) Standard deviation = ________________
(b) Standard deviation of the mean = ____________
(c) The Relative Standard deviation = ________________
2

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