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 2.1 Which of the following sampling techniques is most appropriate for sampling the

diurnal fluctuations of nutrient concentrations in a stream? Provide justification for your answer.

a Random sampling


b Simple stratified sampling

c Systematic sampling


2.2 Provide logical reasoning as to why a single sample storage/preservation protocol is not appropriate for all investigations.


2.4 Multiple determination results from monitoring benzene concentrations (mg L_1) in a groundwater well are listed below.

Measurement Benzene (mg L_1)

.       1 3.35 


.       2 2.25 


.       3 2.09 


.       4 2.01 


.       5 2.15 


Calculate the sample mean and standard deviation for this study.





2.5 An analyst performed five replicate measurements of total lead concentration (mg L_1) in a given wastewater sample. Use Excel to calculate the sample mean and standard deviation from the data below:

3.4 3.9 4.1 3.6 3.7 mg L_1 

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