A Sample of 75 Information Systems Managers Had an Average

question 67

Multiple Choice

A sample of 75 information systems managers had an average hourly income of $40.75 with a standard deviation of $7.00.The standard error of the mean is

• A) 80.83.
• B) 7.0.
• C) .8083.
• D) 1.611.

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Definitions:

Oligotrophic Lake

A type of lake characterized by low nutrient levels, clear waters, and relatively low productivity of plant and animal life.

Net Primary Productivity

The rate at which plants in an ecosystem produce net useful chemical energy; essentially, the amount of biomass created minus the amount used by plants for respiration.

Phytoplankton

Microscopic plant-like organisms that live in aquatic environments, forming the base of many aquatic food webs and producing a significant portion of Earth's oxygen.

Lake Turnover

The seasonal process in lakes where water layers mix, redistributing oxygen from the surface and nutrients from the bottom.