An Analyst Is Assigned a Blind Quality Control Sample of Blood

question 13

Multiple Choice

An analyst is assigned a blind quality control sample of blood containing a drug metabolite. He tests ten separate portions and obtains the following data for the concentration in ug/mL:
25.2
24.8
26.6
27.0
24.0
26.0
25.5
26.3
24.9
23.9
The student t value for 10 samples, nine degrees of freedom is 2.262. Using the sample standard deviation for this data set, what is the ± value of the 95% confidence interval? Report to two decimal places

• A) 0.72
• B) 0.80
• C) 0.76
• D) 0.62

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Definitions:

Flooding

An overflow of water onto land that is normally dry, often the result of heavy rain, snowmelt, or obstruction of water flow.

Channelization

The engineering of a natural stream or river by straightening, deepening, or otherwise modifying its natural course for navigation, flood control, or urban development.

Wetlands

Areas where water covers the soil, either permanently or seasonally, supporting distinct ecosystems with a variety of plant and animal life.

Irrigation Water

Water that is supplied to crops to assist in their growth, often through artificial means such as sprinklers or drip lines.