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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