Identify Time Series and Cross Sections

question 4

Multiple Choice

Identify time series and cross sections.
-A locally owned spa, Alexander's, is interested in adding a tea room that not only
Offers specialty teas but an organic lunch menu. In order to determine how many of its
Regular customers would be interested in such an addition, Alexander's sent out a short e-
Mail questionnaire. One question asked its customers to indicate how much they spend
Monthly on all natural, organic products. These data are

• A) cross-sectional.
• B) time series.
• C) categorical.
• D) transactional.
• E) experimental.

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Definitions:

Pollution

The introduction of contaminants into the natural environment causing adverse change, through substances or energy.

Non-native Species

Species that are introduced into an environment where they do not naturally occur, often causing harm to local ecosystems and species.

Mutualism

A type of symbiotic relationship between two organisms where both organisms benefit from the interaction.

Commensalism

A symbiotic relationship between two organisms where one benefits without harming or helping the other.